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Added more docs; minor Phase One IIQ white level adjustment

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torger
2013-10-23 21:21:58 +02:00
parent 9ef10d741a
commit ed1495e6d1
1 changed files with 33 additions and 9 deletions
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42
rtengine/camconst.json
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@@ -248,6 +248,29 @@ complete info):
- Sony ARW2: no scaling. Generally black level around 512, and white level
16350.
Note that some raw formats may go through a certain amount of pre-processing
based on meta data, such as curve and levels adjustments and various
calibrations. The Phase One IIQ is one example, and this means that if you
look at the data in a raw analyzer such as RawDigger it may perform a
different type of preprocessing than RawTherapee's loader does, and you may
end up providing incompatible black/white levels.
You can use RawTherapee for analysis too, it's safer as you are using it's
own raw decoder but it's not as user-friendly: enable verbose mode in options
so you get output on the console (you need to start RT from a console to see
the output). When you load a file you will see a message of current black
and white levels and if they came from dcraw or camconst.json. If you're
adjusting an existing camconst.json value you can just read what it is in
the file and not need to enable verbose output. Reset exposure sliders to
neutral, and zoom in on a clipped highlight. Move around the mouse pointer,
it should show stable 100% on R G B. If so, the white level is not too high,
it could however be too low. To test that, go to the raw tab and adjust the
"whitepoint linear correction factor", reduce it until one of the channels
is no longer 100%, and then increase 0.01 so all are 100 again. Usually you
play around in the range 0.90 to 0.99, ie very small adjustment. Then divide
the original white level with your adjustment to get a new larger white level,
which you then enter in your camconst.json file.
*/
{"camera_constants": [
@@ -384,38 +407,39 @@ Quality X: unknown, ie we knowing to little about the camera properties to know
},
/* Phase One: color matrices borrowed from Adobe DNG Converter, black/white levels tested on actual raw files.
Note: the dcraw decoder makes black level subtraction when decoding from metadata in the IIQ format, so
what we see here is the result after that, ie black level is 0. (The actual black level is about 1024 with
white level at 0xfffc=65532) */
Note: the dcraw decoder makes black level subtraction and various corrections to the raw values based on
metadata embedded in the IIQ format, so what we see here is the result after that, ie black level is 0,
and white level is typically at or close to 65535. However sensors vary a bit and can be noisy around clip
so we cut away 0.05 stop from top down to 63300 to be a bit conservative. */
{ // quality A
"make_model": [ "Phase One P40+", "Phase One IQ140", "Phase One P65+", "Phase One IQ160" ],
"dcraw_matrix": [ 8035,435,-962,-6001,13872,2320,-1159,3065,5434 ],
"ranges": { "black": 0, "white": 64400 }
"ranges": { "black": 0, "white": 63300 }
},
{ // quality A
"make_model": [ "Phase One IQ180", "Phase One IQ280" ],
"dcraw_matrix": [ 6294,686,-712,-5435,13417,2211,-1006,2435,5042 ],
"ranges": { "black": 0, "white": 64400 }
"ranges": { "black": 0, "white": 63300 }
},
{ // quality A
"make_model": [ "Phase One P20", "Phase One P20+", "Phase One P25", "Phase One P25+" ],
"dcraw_matrix": [ 2905,732,-237,-8135,16626,1476,-3038,4253,7517 ],
"ranges": { "black": 0, "white": 64400 }
"ranges": { "black": 0, "white": 63300 }
},
{ // quality A
"make_model": [ "Phase One P21", "Phase One P21+" ],
"dcraw_matrix": [ 6516,-2050,-507,-8217,16703,1479,-3492,4741,8489 ],
"ranges": { "black": 0, "white": 64400 }
"ranges": { "black": 0, "white": 63300 }
},
{ // quality A
"make_model": [ "Phase One P30", "Phase One P30+"],
"dcraw_matrix": [ 4516,-244,-36,-7020,14976,2174,-3206,4670,7087 ],
"ranges": { "black": 0, "white": 64400 }
"ranges": { "black": 0, "white": 63300 }
},
{ // quality A
"make_model": [ "Phase One P45", "Phase One P45+" ],
"dcraw_matrix": [ 5053,-24,-117,-5685,14077,1703,-2619,4491,5850 ],
"ranges": { "black": 0, "white": 64400 }
"ranges": { "black": 0, "white": 63300 }
},
// dummy test entry to test the parser and show the format with all entries active