Re-open Generalized Hyperbolic Stretch (#7251)

* GHS GUI first step

* GHS GUI first step

* GUI step 3

* Hide show ghsmethod

* Siril functions for ghs

* Init ghs in iplocallab

* ghs step 2

* ghs step 4

* Comment copyright Pixlnsight 2021

* Smooth highlights and tooltips

* Enabled saturation and luminance ghs mode

* First tooltip

* Ghs tooltips

* Remove wrong packstart inverssh

* Change labels and tooltips

* Disabled mask in global and other improvments

* Comment code

* appimage and windows yml ghs

* Change tooltip

* Ghsmethod hue and change tolltips

* Change tooltip

* Inverse Stretch step 1

* Inverse GHS

* GHS tooltips

* Change tooltips

* Change tooltip

* Linear black point

* Small change to blackpoint

* Change tooltip

* Clean and comment code

* forgotten GHS highlight attenuation msg in history

* Comment code with Transformation equations

* Change tooltip

* Wrong default value balck point

* Comment code iplocallab

* Ghs curve step 1

* GHS curve step 2

* Show GHS setting in a Curve Box

* Tooltip for ghs S curve

* Disabled warning in compilation simpleprocess

* Simplified code part 1

* Simplified code GHS graph part 2

* Improve black point with negatives values

* Improve BP and tooltip

* Listener enable only with GHS

* White point for GHS

* Change label and tooltip

* Improve behavior white point and black point

* Link sliders ghs_SP ghs_LP ghs_HP and change code to avoid balck screen

* hide unused button in diagonal curve GHS

* prevents the GHS representation in S from displaying artifacts if ghs-d=0

* Change tooltips

* Improvment and tooltips

* Forgotten tooltip

* Improve GUI GHS S curve - change tooltips

* Set transition gray areas in S curve GHS with values of the RT-spot

* Change label GHS

* setlogscale blackpoint and symmetry

* Set recursive reference enable by default in controlspotpanel

* Change lastlocalCurvesDir Dirghs in locallabtools and options - change labels

* Added in converttonormal ghsMode.. not sure if this is useful

* DIY to make GHS curve work without the choices

* Change RGB calculation with luminance function working profile

* 5 modes GHS method

* Label to show datas clipped Black point and White point

* Various change white point tooltips

* Bad behavior wp bp labels

* Small change to improccordinator call to ghschanged ghsbwchanged

* Set log scale ghs_D

* Hide Graduated filter if GHS enable

* Luminance Lab in ghsmethod

* Lab slope factor step 1

* Slope and Chromaticity GHS improvments

* Fixed bad sqrt line 17477 iplocallab

* Workaround linear GHS - re-enable Graduated filer GHS

* Change limits slope lab factor

* Ghs chromaticity Lab (Lch)

* Improve ghs chromaticity

* Change labels and tooltips Lab chroma

* Slope Lab to 100

* Noise and saturation RGB

* Saturation RGB standard and labels

* Change histogram and navigator panel without gamma when using working profile

* Remove gray in GHS curve

* Local contrast a minima

* Regularization stretch

* Improve Graduated Filter in all cases GHS Color and Light etc.

* Improves nlmeans to reduce noise after GHS

* Change to GF - tooltip Nlmeans

* Added oW oH tW tH etc.

* Added call GF

* tX tY for previewProps

* Comment code GF

* Improve local contrast ghs

* Change norm to norm2

* Improve GUI mode complexity and Lab GHS

* Show values BP WP in GUI

* Labgrid ghs step 1

* Labgrid for simulation GHS - step 2

* More points for Labgrid ghs

* Clean and comment code

* Fixed crash in inverse GHS white point - set to 10 points for GSH simulation

* Change to black point in inverse GHS

* Intilialize simulation with nothing if new spot

* Remove curve GHS - optimize code simulation - improve GUI

* set ghs default - fixed crash is case HP SP LP

* Fixed crash - I hope in inverse GHS

* Simplify WP and BP limits to avoid crash in inverse GHS

* Clean code with ghscurve - ghsshape

* Change tooltips

* Change to D - GUI - comment code

* Simulation with 4 more points

* Best simulation with point 0.05 and 0.95

* Clean code - change for crsah in Inverse GHS

* Show values WP and BP

* Change tooltips

* Midtones after GHS

* Modification code WP BP

* Tests changes in settings for transition and Shape detection - see Preferences

* Change order labels luma chroma hue

* Fixed bad behavior localllistener denchanged in dcrop.cc

* Save work

* Work on graduated filter

* Improve a little graduated filter SH and others...

* 3 configurations tests graduated filter SH plain image - color more sk - exposure normal

* Forgotten code ...

* Change improccordinator parameter

* Save work printf parameters GF

* New test for GF

* Hide plain image calculation GF

* Small chnages and comment code

* Change tooltip exp graduated filter

* Change tooltip exp graduated filter

* Save work

* Change GF for some tools only in Global and Fullimage - test for GF SH mode plain image

* Fixed crash and GUI part 1

* Others change GF

* Change label - allow GF plain image in SH

* Change GF with cx cy sk

* Adapt locallabtool and locallabtools2 to GF

* Clean code

* GF wavelet only in fullimage and global

* GF - Empirical correction to cx and cy in function of sk

* Change label GHS and position in GUI

* Fixed Black point bad behavior history - an oversight may be age

* Change real strength of GF - to look like GF main

* Include ksk - Skip correction in all code GF

* Passed other parameters to try

* New parameter for GF

* Change position graph-curv ghs and labels black and white point

* Change behavior and default value white point

* Save provisory work

* Save provisory work

* Curve GHS with 21 points including 0 and 1

* Two prameters added to change behavior GF - rationalize their using

* Change Black point direction

* Change range black-point for negatives values - chnage tooltips

* Change tooltips

* Various change to avoid crash and settings defaults

* Disabled showmùaskmethod - set max white point to 5

* Fixed bad behavior when change fullimage to global for mask

* Clean comment code

* Fixed - I hope - bad behavior when we go from Fullimage to Global and vice versa

* Fixed crash in output tif and show time to calculate WP and BP

* Change tooltip BP and WP

* Change tooltips BP WP

* move GF after GHS so as not to influence BP and WP

* Clean code

* Disable all mask and modifications in Global but remain active in fullimage and normal

* Change tooltip graduated filter

* Restore GF in normal mode - and increases GF strength as before

* Clean code locallabtools 1 2

* Comment in calclocalGradientParams in iplocallab for changes in Graduated F

* Change convention labels - tooltips

* Change tooltips

* improves (I hope) the readability of the tooltips

* Remove with comment change complexity in Settings

* Improve settings BP WP - improve tooltips

* Refactor GHS curve and increase resolution

Simplify how the curve parameters are passed to the drawing area.

Use up to 400 line segments to draw the curve.

* Update GHS curve tooltip

Remove statement regarding the number of points used because it is no
longer accurate.

* Update rtdata/languages/default

Co-authored-by: Lawrence37 <45837045+Lawrence37@users.noreply.github.com>

* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Change Luma with Lightness

* Update rtdata/languages/default

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* Update rtdata/languages/default

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* Remove warnings in icmpanel

* Changes suggested by Lawrence37

* GHS - Hide inverse always show in some cases - improve tooltip BP WP

* Change tooltip

* Change tooltip

* Small changes

* Change tootip suggested by Lawrence37 - set midtones and LC set_sensitive in function of D

* Add tooltip as suggest by Lawrence37 for LC and midtones

* Remove tooltip on Frame LC and Midtones

* Remove all traces toottips frame LD and Midtones

* set sensitive BLP and HLP to false if stretch = 0

* Change Beep6581 to Rawtherapee in appimage.yml and Windows.yml

* Hide LC and midtones when Stretch = 0

* Clean up Generalized Hyperbolic Stretch code

Convert some ints into enum classes.

Replace new/delete with std::unique_ptr for image.

Remove unused GHS parameters in ProcParams and ParamsEdited which were
used to draw the curve.

Revert changes to the curve editors because they are not needed.

Simplify the drawing of the curve background for efficiency.

Restore the const-ness of some variables.

* Change appimage.yml and windows.yml

---------

Co-authored-by: Lawrence Lee <45837045+Lawrence37@users.noreply.github.com>

rtdata/languages/default

@@ -887,7 +887,7 @@ HISTORY_MSG_641;Local - Use SH mask
 HISTORY_MSG_642;Local - radius SH
 HISTORY_MSG_643;Local - Blur SH
 HISTORY_MSG_644;Local - inverse SH
-HISTORY_MSG_645;Local - SD - ab-L balance
+HISTORY_MSG_645;Local - SD - Lightness-chroma balance
 HISTORY_MSG_646;Local - Exp mask chroma
 HISTORY_MSG_647;Local - Exp mask gamma
 HISTORY_MSG_648;Local - Exp mask slope
@@ -1101,7 +1101,7 @@ HISTORY_MSG_863;Local - Wavelet merge original image
 HISTORY_MSG_864;Local - Wavelet dir contrast attenuation
 HISTORY_MSG_865;Local - Wavelet dir contrast delta
 HISTORY_MSG_866;Local - Wavelet dir compression
-HISTORY_MSG_868;Local - SD - C-H balance
+HISTORY_MSG_868;Local - SD - Hue-Chroma balance
 HISTORY_MSG_869;Local - Denoise by level
 HISTORY_MSG_870;Local - Wavelet mask curve H
 HISTORY_MSG_871;Local - Wavelet mask curve C
@@ -1568,12 +1568,27 @@ HISTORY_MSG_LOCAL_FEATHERVIB;Local - Vib Gradient feather
 HISTORY_MSG_LOCAL_FEATHERWAV;Local - Wav Gradient feather
 HISTORY_MSG_LOCAL_GAMUTMUNSEL;Local - SC - Avoid Color Shift
 HISTORY_MSG_LOCAL_LOGCIE12;Local - CIECAM - Log encoding
+HISTORY_MSG_LOCAL_GHSMETHOD;Local - GHS - Method
+HISTORY_MSG_LOCAL_GHS_D;Local - GHS - Stretch factor
+HISTORY_MSG_LOCAL_GHS_SLOPE;Local - GHS - Lab slope factor
+HISTORY_MSG_LOCAL_GHS_CHRO;Local - GHS - Lab chromaticity factor
+HISTORY_MSG_LOCAL_GHS_B;Local - GHS - Local intensity
+HISTORY_MSG_LOCAL_GHS_SP;Local - GHS - Symmetry point
+HISTORY_MSG_LOCAL_GHS_LP;Local - GHS - Protect shadows
+HISTORY_MSG_LOCAL_GHS_HP;Local - GHS - Protect highlights
+HISTORY_MSG_LOCAL_GHS_LC;Local - GHS - Local Contrast
+HISTORY_MSG_LOCAL_GHS_MID;Local - GHS - Midtones
+HISTORY_MSG_LOCAL_GHS_BLP;Local - GHS - Black point
+HISTORY_MSG_LOCAL_GHS_HLP;Local - GHS - White point
+HISTORY_MSG_LOCAL_GHS_INV;Local - GHS - Inverse
+HISTORY_MSG_LOCAL_GHS_SMOOTH;Local - GHS - Highlight attenuation
 HISTORY_MSG_LOCAL_LOG_BLACKS;Local - Log Blacks distribution
 HISTORY_MSG_LOCAL_LOG_COMPR;Local - Log Compress brightness
 HISTORY_MSG_LOCAL_LOG_SAT;Local - Log Saturation control
 HISTORY_MSG_LOCAL_LOG_WHITES;Local - Log Whites distribution
 HISTORY_MSG_LOCAL_OFFSETWAV;Local Wav offset
 HISTORY_MSG_LOCAL_PROCESSWAV;Local - Wavelets - Show modifications
+HISTORY_MSG_LOCAL_NLITER;Local - Nlmeans - Iterations
 HISTORY_MSG_LOCAL_QJMETHOD;Local - CIECAM Tone mapping operator Q and J
 HISTORY_MSG_LOCAL_SIGBLCIE;Local - CIECAM Blend 5.11
 HISTORY_MSG_LOCAL_SIGDACIE;Local - CIECAM Contrast 5.11
@@ -2989,7 +3004,7 @@ TP_LOCALLAB_ACTIV;Luminance only
 TP_LOCALLAB_ACTIVSPOT;Enable Spot
 TP_LOCALLAB_ADJ;Equalizer Color
 TP_LOCALLAB_AMOUNT;Amount
-TP_LOCALLAB_ARTIF;Shape detection
+TP_LOCALLAB_ARTIF;ΔE Shape detection
 TP_LOCALLAB_ARTIF_TOOLTIP;ΔE scope threshold increases the range of ΔE scope. High values are for very wide gamut images.\nIncreasing ΔE decay can improve shape detection, but can also reduce the scope.
 TP_LOCALLAB_AUTOGRAY;Auto mean luminance (Yb%)
 TP_LOCALLAB_AUTOGRAYCIE;Automatic
@@ -2999,9 +3014,9 @@ TP_LOCALLAB_AVOIDMUN;Munsell correction only
 TP_LOCALLAB_AVOIDMUN_TOOLTIP;Munsell correction always disabled when Jz or CAM16 is used.
 TP_LOCALLAB_AVOIDNEG;Pre-filter zero and negative values
 TP_LOCALLAB_AVOIDRAD;Soft radius
-TP_LOCALLAB_BALAN;ab-L balance (ΔE)
+TP_LOCALLAB_BALAN;Lightness-Chroma balance
 TP_LOCALLAB_BALANEXP;Laplacian balance
-TP_LOCALLAB_BALANH;C-H balance (ΔE)
+TP_LOCALLAB_BALANH;Hue-Chroma balance
 TP_LOCALLAB_BALAN_TOOLTIP;Changes the ΔE algorithm parameters.\nTakes into account more or less a*b* or L*, or more or less C or H.\nNot for Denoise.
 TP_LOCALLAB_BASELOG;Shadows range (logarithm base)
 TP_LOCALLAB_BILATERAL;Bilateral filter
@@ -3209,12 +3224,12 @@ TP_LOCALLAB_EXPCHROMA_TOOLTIP;Use in association with 'Exposure compensation f'
 TP_LOCALLAB_EXPCOLOR_TOOLTIP;Adjust color, lightness, contrast and correct small defects such as red-eye, sensor dust etc.
 TP_LOCALLAB_EXPCOMP;Exposure compensation ƒ
 TP_LOCALLAB_EXPCOMPINV;Exposure compensation
-TP_LOCALLAB_EXPCOMP_TOOLTIP;For portraits or images with a low color gradient. You can change 'Shape detection' in 'Settings':\n\nIncrease 'ΔE scope threshold'\nReduce 'ΔE decay'\nIncrease 'ab-L balance (ΔE)'
+TP_LOCALLAB_EXPCOMP_TOOLTIP;For portraits or images with a low color gradient. You can change 'Shape detection' in 'Settings':\n\nIncrease 'ΔE scope threshold'\nReduce 'ΔE decay'\nIncrease 'Lightness-chroma balance (ΔE)'
 TP_LOCALLAB_EXPCONTRASTPYR_TOOLTIP;See the documentation for Wavelet Levels.\nThere are some differences in the Selective Editing version, which has more tools and more possibilities for working on individual detail levels.\nE.g. wavelet-level tone mapping.
 TP_LOCALLAB_EXPCONTRAST_TOOLTIP;Avoid spots that are too small ( < 32x32 pixels).\nUse low 'Transition value' and high 'Transition decay' and 'Scope' to simulate small spots and deal with defects.\nUse 'Clarity and Sharp mask and Blend and Soften Images' if necessary by adjusting 'Soft radius' to reduce artifacts.
 TP_LOCALLAB_EXPCURV;Curves
 TP_LOCALLAB_EXPGRAD;Graduated Filter
-TP_LOCALLAB_EXPGRADCOL_TOOLTIP;A graduated filter is available in Color and Light (luminance, chrominance &amp; hue gradients, and 'Merge file'), Exposure (luminance grad.), Exposure Mask (luminance grad.), Shadows/Highlights (luminance grad.), Vibrance (luminance, chrominance &amp; hue gradients), Local contrast &amp; wavelet pyramid (local contrast grad.).\nFeather is located in Settings.
+TP_LOCALLAB_EXPGRADCOL_TOOLTIP;A graduated filter is available in Color & Light (luminance, chrominance & hue gradients, and 'Merge file'), Exposure (luminance gradient), Exposure Mask (luminance gradient), Shadows/Highlights (luminance gradient), Vibrance (luminance, chrominance & hue gradients), Local contrast & wavelet pyramid (local contrast gradient).\nThe graduated filter preview is only accurate when the image is viewed in fit-to-screen mode.\n\nThe graduated filter is only available in Full image or Global mode.
 TP_LOCALLAB_EXPLAPBAL_TOOLTIP;Changes the transformed/original image blend.
 TP_LOCALLAB_EXPLAPGAMM_TOOLTIP;Changes the behaviour for images with too much or too little contrast by adding a gamma curve before and after the Laplace transform.
 TP_LOCALLAB_EXPLAPLIN_TOOLTIP;Changes the behaviour for underexposed images by adding a linear component prior to applying the Laplace transform.
@@ -3259,6 +3274,51 @@ TP_LOCALLAB_GAMUTNON;None
 TP_LOCALLAB_GAMUTXYZABSO;XYZ Absolute
 TP_LOCALLAB_GAMUTXYZRELA;XYZ Relative
 TP_LOCALLAB_GAMW;Gamma (wavelet pyramids)
+TP_LOCALLAB_GHSBPWP;Clipped pixel count - Shadows:%1 Highlights:%2
+TP_LOCALLAB_GHSBPWPVALUE;Pixel values - Darkest:%1 Lightest:%2
+TP_LOCALLAB_GHS_GHSDIAG;GHS Curve Visualization
+TP_LOCALLAB_GHS_SIMUL_TOOLTIP;Gives a representation of the GHS function.
+TP_LOCALLAB_GHSRGBLUM;RGB Luminance
+TP_LOCALLAB_GHSRGBSTD;RGB Standard
+TP_LOCALLAB_GHSLAB;Lightness & chromaticity (Lab)
+TP_LOCALLAB_GHSHUE;Hue (HSL)
+TP_LOCALLAB_GHSLUM;Luminance (HSL)
+TP_LOCALLAB_GHSSAT;Saturation (HSL)
+TP_LOCALLAB_GHSFRA;Stretch Settings
+TP_LOCALLAB_GHS_D;Stretch factor (D)
+TP_LOCALLAB_GHS_B;Local intensity (b)
+TP_LOCALLAB_GHS_SP;Symmetry point (SP)
+TP_LOCALLAB_GHS_LP;Protect shadows (LP)
+TP_LOCALLAB_GHS_HP;Protect highlights (HP)
+TP_LOCALLAB_GHS_LC;Value (LC)
+TP_LOCALLAB_GHS_LC_FRAME;Stretch Regularization & Midtones
+TP_LOCALLAB_GHS_LC_TOOLTIP;Slightly increases local contrast that was weakened by stretching.\nCan be completed by other tools specific to local contrast such as wavelets.\n\nWhen Stretch factor is 0.002 or less, Stretch Regularization & Midtones is disabled.
+TP_LOCALLAB_GHS_MID;Midtones
+TP_LOCALLAB_GHS_MID_TOOLTIP;Adjusts midtone balance after GHS transformation.\n Can be used to rebalance the midtones of the image after stretching.\n\nWhen Stretch factor is 0.002 or less, Stretch Regularization & Midtones is disabled
+TP_LOCALLAB_GHS_BPFRAME_TOOLTIP;Sets the Black point (BP linear), White point (WP linear) and Highlight for a linear stretch of the image.\n\n * Black Point (BP linear) and White Point (WP linear) settings are only available if Stretch factor (D) is between 0.001 and 0.002 so as to not affect the histogram.\n\n * When Stretch factor is 0.002 or less, all stretch settings except for Black point and White point have no effect.\n\n * Black point (BP linear) and White point (WP linear) settings are sensitive to the general settings upstream of GHS: Highlight reconstruction, White balance and RAW processes.\n\n * To have relevant Black Point (BP linear) and White Point (WP linear) settings, the entire image must be analyzed. It is recommended to use 'Fit whole image to screen - Shortcut Alt-f'.
+TP_LOCALLAB_GHS_BLACKPOINT_FRAME;Black point/White point/Highlights
+TP_LOCALLAB_GHS_BLP;Black point (BP linear)
+TP_LOCALLAB_GHS_BLP_TOOLTIP;Sets the Black point for a linear stretch of the image.\n * For negatives slider values, in GHS ‘normal’, shadows are raised linearly to avoid excessive noise build-up and facilitate GHS work.\n * For positives slider values, the histogram is shifted to the left. For Raw images, you can also use Raw-Tab > Raw Black Points – Dehaze,  which is more precise.\n * Contrast gained by performing the linear stretch will be evenly distributed over the image.\n\n * You can adjust a linear black point offset to either:\n  - account for noise in the deep shadows.\n  - adjust the histogram.\n\n * It is recommended to adjust these sliders before the main GHS sliders to avoid clipping data. A very low Stretch factor (D) value (0.001 by default) is recommended for performing this adjustment.\n * The label 'Clipped pixel count Shadows:x Highlights=y' shows you the number of pixels that would be clipped without adjusting the two sliders.\n * The label Pixel values - Darkest:w Lightest:z shows you the minimum and maximum values in the range [0, 1].\n\n * In ‘Inverse GHS’ mode the behavior is reversed and there are possible interactions with the White point.
+TP_LOCALLAB_GHS_HLP;White point (WP linear)
+TP_LOCALLAB_GHS_METHOD_TOOLTIP;The Generalized Hyperbolic Stretch (GHS) process allows you to transform the values of pixels in your image to improve the representation of the underlying data for human visualisation.\nThe generalized hyperbolic equations used in the GHS process have five main parameters. This allows significant flexibility in designing the "shape" of the transformation.\n\nTypical uses of pixel intensity transformations include:\n * Initial stretch of pixel data from linear state.\n * Addition of contrast to key areas of the image.\n * Overall brightening or darkening of the image.\n * Adjustment of the image dynamic range.\n * Adjustment of pixel data in RGB Luminance, RGB standard, Luminance - chromaticity (Lab/Lch), Luminance (HSL), Saturation (HSL), or Hue (HSL) channels.\n\n * For a better results, you can proceed in several steps, creating 2 or more RT-spots each superimposed with the GHS tool. For each of the RT-Spots, the Symmetry point (SP) base value will be different. Use the histogram peak to position the SP value.\n * For example, you can start the system in RGB mode (1st Spot), then the 2nd Spot in RGB mode with a different SP, and the 3rd in Saturation or Hue mode.\n * You can mix RT-spots in 'Normal' mode and 'Inverse' mode to restore contrast balance.\n * Full Image allows you to limit the effect to specific colors based on the deltaE.
+TP_LOCALLAB_GHS_HLP_TOOLTIP;Sets the White point for a linear stretch of the image. Any pixel with value greater than the White point input will be clipped and the data lost.\n * Contrast gained by performing the linear stretch will be evenly distributed over the image, which will be brightened. Pixels with values greater than the White point will appear white and have a value of 1.0.\n * Setting this parameter to a value greater than 1 will extend the dynamic range at the high end.\n * The 'Highlight reconstruction' method has a very strong impact on the White-point value.\n\n * It is recommended to adjust this slider before the main GHS sliders to avoid clipping data. A very low Stretch factor (D) value (0.001 by default) is recommended for performing this adjustment.\n * The label 'Clipped pixel count - Shadows:x Highlights=y' shows you the number of pixels that would be clipped without adjusting the two sliders.\n * The label Pixel values - Darkest:w Lightest:z shows you the minimum and maximum values in the range [0, 1].\n\n * In ‘Inverse GHS’ mode the behavior is reversed and there are possible interactions with the Black point.
+TP_LOCALLAB_GHS_MODELIN;Linear
+TP_LOCALLAB_GHS_MODECUR;GHS
+TP_LOCALLAB_GHS_D_TOOLTIP;This parameter controls the amount of stretch. If the Stretch factor is set to zero, there is no stretch. In other words, the transformation is the identity transformation.\n\n * Black Point (BP linear) and White Point (WP linear) settings are only available if Stretch factor (D) is between 0.001 and 0.002.
+TP_LOCALLAB_GHS_B_TOOLTIP;This parameter controls how tightly focused the stretch is around the Symmetry point (SP) by changing the form of the transform itself:\n * For concentrated stretches (such as initial stretches on linear images) a large 'b' factor should be employed to focus a stretch within a histogram peak while de-focusing the stretch away from the histogram peak.\n * For adjustment of non-linear images, lower 'b' parameters should be employed to distribute contrast and brightness more evenly.\n * Large positive values of 'b' can be thought of as a histogram widener, i.e. spreading the histogram wider about the focus point, SP.\n * By contrast, lower values of 'b' tend to shift the histogram to a brighter or dimmer position without affecting its width too greatly.\n * As a general rule, the level of 'b' employed will decrease as a stretch sequence nears completion, although larger 'b' values can still be employed for precise placement of additional contrast.
+TP_LOCALLAB_GHS_SLOPE;Slope Lab factor (S)
+TP_LOCALLAB_GHS_SLOPE_TOOLTIP;Changes the slope of the Lab transform to improve shadow rendering.
+TP_LOCALLAB_GHS_CHRO;Chromaticity Lab factor (C)
+TP_LOCALLAB_GHS_CHRO_TOOLTIP;GHS chromaticity - compensate large stretches
+TP_LOCALLAB_GHSLABFRA;Lab settings
+TP_LOCALLAB_GHS_SP_TOOLTIP;The default value of 0.015 is suitable for the majority of images.\n * This is the key balance value of the GHS system.\n * Sets the focus point around which the stretch is applied - contrast will be distributed symmetrically about SP.\n * While 'b' provides the degree of focus of the stretch, SP determines where that focus is applied.\n * SP should generally be placed within a histogram peak so that the stretch will widen and lower the peak by adding the most contrast in the stretch at that point. Pixel values will move away from the SP location.
+TP_LOCALLAB_GHS_LP_TOOLTIP;Sets a value below which the stretch is modified to preserve contrast in the shadows/lowlights. This is done by performing a linear stretch of the data below the 'LP' level by reserving contrast from the rest of the image. Moving the LP level towards the current setting of SP changes both the scope (range) and the amount of this contrast reservation. The net effect is to push the overall stretch to higher brightness levels while keeping the contrast and definition in the background. The amount of contrast reserved for the lowlights is such that the continuity of the stretch is preserved.\n * This parameter must be at least 0 and no greater than the Symmetry point.\n * The adjuster will automatically limit the maximum value to the Symmetry Point (SP).\n\n * Using Black point - negative values - when possible, allows to change both the value of Symmetry point (SP) and the action of Protect shadows (LP).
+TP_LOCALLAB_GHS_HP_TOOLTIP;Sets a value above which the stretch is modified to preserve contrast in the highlights. This is done by performing a linear stretch of the data above the 'HP' level by reserving contrast from the rest of the image. Moving the HP level towards the current setting of SP increases both the scope (range) and the amount of this contrast reservation. The net effect is to push the overall stretch to lower brightness levels while keeping the contrast and definition in the highlights. The amount of contrast reserved for the highlights is such that the continuity of the stretch is preserved.\n * This parameter must be at most 1 and no less than the Symmetry point.\n * The adjuster will automatically limits the maximum value to the Symmetry Point (SP).\n\n * Using Highlight attenuation helps to reinforce the action of Protect highlights (HP).
+TP_LOCALLAB_GHS_SMOOTH_TOOLTIP;Smooth and soften highlight areas. Amplifies 'Protect highlights (HP)' action.
+TP_LOCALLAB_GHS_SMOOTH;Highlight attenuation
+TP_LOCALLAB_GHS_CURVE_TOOLTIP;Shows the 'S' curve generated by GHS calculations. Mainly for educational purposes.\n\n * The curve only reacts to the adjusters and cannot be modified directly.
+TP_LOCALLAB_GHS_INV;Inverse GHS
+TP_LOCALLAB_GHS_INV_TOOLTIP;The inverse GHS is useful for working in negative space. It adds contrast on the far right and left of the histogram, brightening the deep shadows, darkening the bright highlights, and squeezing the histogram to the middle.\n\n * The Generalized Hyperbolic inverse transformation allows you to recover your original image, subject to mathematical precision, but you can use it for other purposes.\n\n * If the White point and Black point were changed in normal mode, they will likely need to be readjusted. The White point often needs to be readjusted lower. There is interaction between the two settings.
 TP_LOCALLAB_GRADANG;Gradient angle
 TP_LOCALLAB_GRADANG_TOOLTIP;Rotation angle in degrees: -180 0 +180.
 TP_LOCALLAB_GRADFRA;Graduated Filter Mask
@@ -3274,7 +3334,7 @@ TP_LOCALLAB_GRADSTRLUM;Luma gradient strength
 TP_LOCALLAB_GRAINFRA;Film Grain 1:1
 TP_LOCALLAB_GRAINFRA2;Coarseness
 TP_LOCALLAB_GRAIN_TOOLTIP;Adds film-like grain to the image.
-TP_LOCALLAB_GRALWFRA;Graduated filter (local contrast)
+TP_LOCALLAB_GRALWFRA;Graduated filter (local contrast: Full image & Global)
 TP_LOCALLAB_GRIDFRAME_TOOLTIP;You can use this tool as a brush. Use a small spot and adapt the 'Transition value' and 'Transition decay'\nOnly 'Normal' mode and possibly Hue, Saturation, Color, Luminosity are concerned by Merge background (ΔE).
 TP_LOCALLAB_GRIDMETH_TOOLTIP;Color toning: the luminance is taken into account when varying chroma. Equivalent to H=f(H) if the 'white dot' on the grid remains at zero and you only vary the 'black dot'. Equivalent to 'Color toning' if you vary the 2 dots.\n\nDirect: acts directly on the chroma.
 TP_LOCALLAB_GRIDONE;Color Toning
@@ -3520,6 +3580,7 @@ TP_LOCALLAB_MRONE;None
 TP_LOCALLAB_MRTHR;Original Image
 TP_LOCALLAB_MULTIPL_TOOLTIP;Wide-range tone adjustment: -18EV to +4EV. The first slider acts on very dark tones between -18EV and -6EV. The last slider acts on light tones up to 4EV.
 TP_LOCALLAB_NEIGH;Radius
+TP_LOCALLAB_NLDENOISENLITER_TOOLTIP;Run multiple iterations of Nlmeans. Results are often better with multiple iterations and low Strength.
 TP_LOCALLAB_NLDENOISENLGAM_TOOLTIP;Lower values preserve details and texture, higher values increase denoise.\nIf gamma = 3.0 Luminance 'linear' is used.
 TP_LOCALLAB_NLDENOISENLPAT_TOOLTIP;Use this slider to adapt the amount of denoise to the size of the objects to be processed.
 TP_LOCALLAB_NLDENOISENLRAD_TOOLTIP;Higher values increase denoise at the expense of processing time.
@@ -3528,6 +3589,7 @@ TP_LOCALLAB_NLDET;Detail recovery
 TP_LOCALLAB_NLFRA;Non-local Means: Luminance
 TP_LOCALLAB_NLFRAME_TOOLTIP;Non-local means denoising takes a mean of all pixels in the image, weighted by how similar they are to the target pixel.\nReduces loss of detail compared with local mean algorithms.\nOnly luminance noise is taken into account. Chrominance noise is best processed using wavelets and Fourier transforms (DCT).\nCan be used in conjunction with 'Luminance denoise by level' or on its own.
 TP_LOCALLAB_NLGAM;Gamma
+TP_LOCALLAB_NLITER;Iterations
 TP_LOCALLAB_NLLUM;Strength
 TP_LOCALLAB_NLPAT;Maximum patch size
 TP_LOCALLAB_NLRAD;Maximum radius size
@@ -3635,12 +3697,13 @@ TP_LOCALLAB_SENSI_TOOLTIP;Adjusts the scope of the action:\nSmall values limit t
 TP_LOCALLAB_SETTINGS;Settings
 TP_LOCALLAB_SH1;Shadows Highlights
 TP_LOCALLAB_SH2;Equalizer
+TP_LOCALLAB_SH3;Generalized Hyperbolic Stretch
 TP_LOCALLAB_SHADEX;Shadows
 TP_LOCALLAB_SHADEXCOMP;Shadow compression
-TP_LOCALLAB_SHADHIGH;Shadows/Highlights & Tone Equalizer
+TP_LOCALLAB_SHADHIGH;Shadows/Highlights, Equalizer & GHS
 TP_LOCALLAB_SHADHMASK_TOOLTIP;Lowers the highlights of the mask in the same way as the shadows/highlights algorithm.
 TP_LOCALLAB_SHADMASK_TOOLTIP;Lifts the shadows of the mask in the same way as the shadows/highlights algorithm.
-TP_LOCALLAB_SHADOWHIGHLIGHT_TOOLTIP;Adjust shadows and highlights either with shadows &amp; highlights sliders or with a tone equalizer.\nCan be used instead of, or in conjunction with the Exposure module.\nCan also be used as a graduated filter.
+TP_LOCALLAB_SHADOWHIGHLIGHT_TOOLTIP;Adjust shadows and highlights either with 'Shadows Highlights' sliders, 'Tone Equalizer', or 'Generalized Hyperbolic Stretch' (GHS).\nCan be used instead of, or in conjunction with the Exposure module, or for GHS as a tone mapper.
 TP_LOCALLAB_SHAMASKCOL;Shadows
 TP_LOCALLAB_SHAPETYPE;Spot shape
 TP_LOCALLAB_SHAPE_TOOLTIP;'Ellipse' is the normal mode.\n 'Rectangle' can be used in certain cases, for example to work in full-image mode by placing the delimiters outside the preview area. In this case, set transition = 100.\n\nFuture developments will include polygon shapes and Bezier curves.
@@ -3685,7 +3748,7 @@ TP_LOCALLAB_SHOWT;Mask And Modifications
 TP_LOCALLAB_SHOWVI;Mask And Modifications
 TP_LOCALLAB_SHRESFRA;Shadows/Highlights & TRC
 TP_LOCALLAB_SHTRC_TOOLTIP;Based on 'working profile' (only those provided), modifies the tones of the image by acting on a TRC (Tone Response Curve).\nGamma acts mainly on light tones.\nSlope acts mainly on dark tones.\nIt is recommended that the TRC of both devices (monitor and output profile) be sRGB (default).
-TP_LOCALLAB_SH_TOOLNAME;Shadows/Highlights & Tone Equalizer
+TP_LOCALLAB_SH_TOOLNAME;Shadows/Highlights, Equalizer & GHS
 TP_LOCALLAB_SIGBLACKSSCIE;Blacks distribution
 TP_LOCALLAB_SIGCIE;Sigmoid
 TP_LOCALLAB_SIGFRA;Sigmoid Q & Slope based
@@ -3776,7 +3839,7 @@ TP_LOCALLAB_SYMSL;Symmetrical (mouse + sliders)
 TP_LOCALLAB_TARGET_GRAY;Mean luminance (Yb%)
 TP_LOCALLAB_TE_PIVOT;Pivot (Ev)
 TP_LOCALLAB_THRES;Threshold structure
-TP_LOCALLAB_THRESDELTAE;ΔE scope threshold
+TP_LOCALLAB_THRESDELTAE;Range
 TP_LOCALLAB_THRESRETI;Threshold
 TP_LOCALLAB_THRESWAV;Balance threshold
 TP_LOCALLAB_TLABEL;TM Min=%1 Max=%2 Mean=%3 Sig=%4
@@ -3795,10 +3858,10 @@ TP_LOCALLAB_TOOLMASK;Mask Tools
 TP_LOCALLAB_TOOLMASK_2;Wavelets
 TP_LOCALLAB_TOOLMASK_TOOLTIP;Structure mask (slider) with the checkbox 'Structure mask as tool' checked: in this case a mask showing the structure will be generated after one or more of the 2 curves L(L) or LC(H) has been modified.\n Here, the 'Structure mask' behaves like the other Mask tools : Gamma, Slope, etc.\n It allows you to vary the action on the mask according to the structure of the image.
 TP_LOCALLAB_TRANSIT;Transition Gradient
-TP_LOCALLAB_TRANSITGRAD;Transition differentiation XY
+TP_LOCALLAB_TRANSITGRAD;Symmetry X & Y
 TP_LOCALLAB_TRANSITGRAD_TOOLTIP;Allows you to vary the y-axis transition.
-TP_LOCALLAB_TRANSITVALUE;Transition value
-TP_LOCALLAB_TRANSITWEAK;Transition decay (linear-log)
+TP_LOCALLAB_TRANSITVALUE;Value
+TP_LOCALLAB_TRANSITWEAK;Decay (linear-log)
 TP_LOCALLAB_TRANSITWEAK_TOOLTIP;Adjust transition decay function: 1 linear , 2 parabolic, 3 cubic up to ^25.\nCan be used in conjunction with very low transition values to reduce defects (CBDL, Wavelets, Color &amp; Light).
 TP_LOCALLAB_TRANSIT_TOOLTIP;Adjust smoothness of transition between affected and unaffected areas as a percentage of the 'radius'.
 TP_LOCALLAB_TRANSMISSIONGAIN;Transmission gain