diff --git a/rtdata/languages/Catala b/rtdata/languages/Catala
index 44264c803..2a09e6ffc 100644
--- a/rtdata/languages/Catala
+++ b/rtdata/languages/Catala
@@ -679,7 +679,6 @@ SAVEDLG_SUBSAMP;Submostreig
 SAVEDLG_SUBSAMP_1;Millor compressió
 SAVEDLG_SUBSAMP_2;Equilibrat
 SAVEDLG_SUBSAMP_3;Millor qualitat
-SAVEDLG_SUBSAMP_TOOLTIP;Gran compressió: 4:1:1\nEquilibrat: 4:2:2\nMillor qualitat: 4:4:4
 SAVEDLG_TIFFUNCOMPRESSED;TIFF no comprimit
 SAVEDLG_WARNFILENAME;El fitxer es dirà
 SHCSELECTOR_TOOLTIP;Clic al botó dret per a restaurar\nla posició dels 3 nivells.
@@ -1426,6 +1425,7 @@ ZOOMPANEL_ZOOMOUT;Allunya\nDrecera: <b>-</b>
 !PROGRESSBAR_NOIMAGES;No images found
 !PROGRESSBAR_SNAPSHOT_ADDED;Snapshot added
 !SAVEDLG_FORCEFORMATOPTS;Force saving options
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !TP_BWMIX_ALGO;Algorithm OYCPM
 !TP_BWMIX_ALGO_LI;Linear
 !TP_BWMIX_ALGO_SP;Special effects
diff --git a/rtdata/languages/Chinese (Simplified) b/rtdata/languages/Chinese (Simplified)
index 59655a35b..4ff80fe80 100644
--- a/rtdata/languages/Chinese (Simplified)	
+++ b/rtdata/languages/Chinese (Simplified)	
@@ -1392,7 +1392,7 @@ ZOOMPANEL_ZOOMOUT;缩放拉远\n快捷键: <b>-</b>
 !PROGRESSBAR_PROCESSING_PROFILESAVED;Processing profile saved
 !PROGRESSBAR_SNAPSHOT_ADDED;Snapshot added
 !PROGRESSDLG_PROFILECHANGEDINBROWSER;Processing profile changed in browser
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
 !THRESHOLDSELECTOR_BL;Bottom-left
 !THRESHOLDSELECTOR_BR;Bottom-right
diff --git a/rtdata/languages/Chinese (Traditional) b/rtdata/languages/Chinese (Traditional)
index 073913e97..6d4f891e0 100644
--- a/rtdata/languages/Chinese (Traditional)	
+++ b/rtdata/languages/Chinese (Traditional)	
@@ -1213,7 +1213,7 @@ TP_WBALANCE_TEMPERATURE;色溫
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_TIFFUNCOMPRESSED;Uncompressed TIFF
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
diff --git a/rtdata/languages/Czech b/rtdata/languages/Czech
index ed6060246..189b91601 100644
--- a/rtdata/languages/Czech
+++ b/rtdata/languages/Czech
@@ -1022,7 +1022,6 @@ SAVEDLG_SUBSAMP;Podvzorkování
 SAVEDLG_SUBSAMP_1;Nejlepší komprese
 SAVEDLG_SUBSAMP_2;Vyvážené
 SAVEDLG_SUBSAMP_3;Nejlepší kvalita
-SAVEDLG_SUBSAMP_TOOLTIP;Nejlepší komprese: 4:1:1\nVyvážená: 4:2:2\nNejlepší kvalita: 4:4:4
 SAVEDLG_TIFFUNCOMPRESSED;Nekomprimovaný TIFF
 SAVEDLG_WARNFILENAME;Soubor bude pojmenován
 SHCSELECTOR_TOOLTIP;Klikněte pravým tlačítkem myši pro obnovení výchozí pozice těchto tří posuvníků.
@@ -1844,6 +1843,7 @@ ZOOMPANEL_ZOOMOUT;Oddálit\nZkratka: <b>-</b>
 !PREFERENCES_SERIALIZE_TIFF_READ;Tiff Read Settings
 !PREFERENCES_SERIALIZE_TIFF_READ_LABEL;Serialize read of tiff files
 !PREFERENCES_SERIALIZE_TIFF_READ_TOOLTIP;When working with folders full of uncompressed tiff files enabling this option can increase performance of thumb generation.
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !TP_CROP_GTHARMMEANS;Harmonic Means
 !TP_CROP_GTTRIANGLE1;Golden Triangles 1
 !TP_CROP_GTTRIANGLE2;Golden Triangles 2
diff --git a/rtdata/languages/Dansk b/rtdata/languages/Dansk
index 1d0f8d915..4e00d4087 100644
--- a/rtdata/languages/Dansk
+++ b/rtdata/languages/Dansk
@@ -1211,7 +1211,7 @@ TP_WBALANCE_TEMPERATURE;Temperatur
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_TIFFUNCOMPRESSED;Uncompressed TIFF
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
diff --git a/rtdata/languages/Deutsch b/rtdata/languages/Deutsch
index df168c0df..5e11ac6c4 100644
--- a/rtdata/languages/Deutsch
+++ b/rtdata/languages/Deutsch
@@ -1106,7 +1106,6 @@ SAVEDLG_SUBSAMP;Komprimierung
 SAVEDLG_SUBSAMP_1;Beste Kompression
 SAVEDLG_SUBSAMP_2;Ausgeglichen
 SAVEDLG_SUBSAMP_3;Beste Qualität
-SAVEDLG_SUBSAMP_TOOLTIP;Beste Kompression: 4:1:1\nAusgeglichen: 4:2:2\nBeste Qualität: 4:4:4
 SAVEDLG_TIFFUNCOMPRESSED;Unkomprimiertes TIFF
 SAVEDLG_WARNFILENAME;Die Datei wird gespeichert als
 SHCSELECTOR_TOOLTIP;Um die 3 Regler zurückzusetzen, rechte Maustaste klicken.
@@ -1938,6 +1937,7 @@ ZOOMPANEL_ZOOMOUT;Herauszoomen\nTaste: <b>-</b>
 !HISTORY_MSG_425;Retinex - Log base
 !HISTORY_MSG_426;Retinex - Hue equalizer
 !PARTIALPASTE_RETINEX;Retinex
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !TP_RETINEX_CONTEDIT_HSL;Histogram equalizer HSL
 !TP_RETINEX_CONTEDIT_LAB;Histogram equalizer L*a*b*
 !TP_RETINEX_CONTEDIT_LH;Hue equalizer
diff --git a/rtdata/languages/English (UK) b/rtdata/languages/English (UK)
index f49f0d428..eabd6b6d5 100644
--- a/rtdata/languages/English (UK)	
+++ b/rtdata/languages/English (UK)	
@@ -1167,7 +1167,7 @@ TP_WBALANCE_EQBLUERED_TOOLTIP;Allows to deviate from the normal behaviour of "wh
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_TIFFUNCOMPRESSED;Uncompressed TIFF
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
diff --git a/rtdata/languages/English (US) b/rtdata/languages/English (US)
index d19252b22..41bba0f1b 100644
--- a/rtdata/languages/English (US)	
+++ b/rtdata/languages/English (US)	
@@ -1107,7 +1107,7 @@
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_TIFFUNCOMPRESSED;Uncompressed TIFF
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
diff --git a/rtdata/languages/Espanol b/rtdata/languages/Espanol
index 0dba2a834..75daeba15 100644
--- a/rtdata/languages/Espanol
+++ b/rtdata/languages/Espanol
@@ -953,7 +953,6 @@ SAVEDLG_SUBSAMP;Submuestreo
 SAVEDLG_SUBSAMP_1;Máxima compresión
 SAVEDLG_SUBSAMP_2;Balanceado
 SAVEDLG_SUBSAMP_3;Máxima calidad
-SAVEDLG_SUBSAMP_TOOLTIP;Máxima compresión: 4:1:1\nBalanceado: 4:2:2\nMáxima calidad: 4:4:4
 SAVEDLG_TIFFUNCOMPRESSED;TIFF sin compresión
 SAVEDLG_WARNFILENAME;Se asignará nombre al archivo
 SHCSELECTOR_TOOLTIP;Pulsar el botón derecho del ratón para restablecer la posición de los tres controles deslizantes
@@ -1769,6 +1768,7 @@ ZOOMPANEL_ZOOMOUT;Reducir Zoom\nAtajo: <b>-</b>
 !PREFERENCES_WLONE;One level
 !PREFERENCES_WLTWO;Two levels
 !PREFERENCES_WLZER;No
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !TP_CROP_GTHARMMEANS;Harmonic Means
 !TP_CROP_GTTRIANGLE1;Golden Triangles 1
 !TP_CROP_GTTRIANGLE2;Golden Triangles 2
diff --git a/rtdata/languages/Euskara b/rtdata/languages/Euskara
index 660fd5b61..35b975a94 100644
--- a/rtdata/languages/Euskara
+++ b/rtdata/languages/Euskara
@@ -1211,7 +1211,7 @@ TP_WBALANCE_TEMPERATURE;Tenperatura
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_TIFFUNCOMPRESSED;Uncompressed TIFF
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
diff --git a/rtdata/languages/Francais b/rtdata/languages/Francais
index 1b52f7780..dfb3d8f73 100644
--- a/rtdata/languages/Francais
+++ b/rtdata/languages/Francais
@@ -1084,7 +1084,6 @@ SAVEDLG_SUBSAMP;Sous-échantillonnage
 SAVEDLG_SUBSAMP_1;Meilleure compression
 SAVEDLG_SUBSAMP_2;Équilibré
 SAVEDLG_SUBSAMP_3;Meilleure qualité
-SAVEDLG_SUBSAMP_TOOLTIP;Compression: 4:1:1\nÉquilibré: 4:2:2\nQualité: 4:4:4
 SAVEDLG_TIFFUNCOMPRESSED;TIFF non compressé
 SAVEDLG_WARNFILENAME;Le fichier sera nommé
 SHCSELECTOR_TOOLTIP;Cliquez le bouton droit de la souris\npour réinitialiser la position de ces 3 curseurs
@@ -1918,6 +1917,7 @@ ZOOMPANEL_ZOOMOUT;Zoom Arrière\nRaccourci: <b>-</b>
 !HISTORY_MSG_425;Retinex - Log base
 !HISTORY_MSG_426;Retinex - Hue equalizer
 !PARTIALPASTE_RETINEX;Retinex
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !TP_RETINEX_CONTEDIT_HSL;Histogram equalizer HSL
 !TP_RETINEX_CONTEDIT_LAB;Histogram equalizer L*a*b*
 !TP_RETINEX_CONTEDIT_LH;Hue equalizer
diff --git a/rtdata/languages/Greek b/rtdata/languages/Greek
index d00e0619b..cb42caed4 100644
--- a/rtdata/languages/Greek
+++ b/rtdata/languages/Greek
@@ -1210,7 +1210,7 @@ TP_WBALANCE_TEMPERATURE;Θερμοκρασία
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_TIFFUNCOMPRESSED;Uncompressed TIFF
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
diff --git a/rtdata/languages/Hebrew b/rtdata/languages/Hebrew
index 276fbdf92..28cd5e8fe 100644
--- a/rtdata/languages/Hebrew
+++ b/rtdata/languages/Hebrew
@@ -1211,7 +1211,7 @@ TP_WBALANCE_TEMPERATURE;מידת חום
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_TIFFUNCOMPRESSED;Uncompressed TIFF
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
diff --git a/rtdata/languages/Italiano b/rtdata/languages/Italiano
index 0a20e0cc5..d963ef19a 100644
--- a/rtdata/languages/Italiano
+++ b/rtdata/languages/Italiano
@@ -854,7 +854,6 @@ SAVEDLG_SUBSAMP;Sottocampionamento
 SAVEDLG_SUBSAMP_1;Migliore Compressione
 SAVEDLG_SUBSAMP_2;Bilanciato
 SAVEDLG_SUBSAMP_3;Migliore Qualità
-SAVEDLG_SUBSAMP_TOOLTIP;Migliore Compressione: 4:1:1\nBilanciato: 4:2:2\nMigliore Qualità: 4:4:4
 SAVEDLG_TIFFUNCOMPRESSED;TIFF non compresso
 SAVEDLG_WARNFILENAME;Il file verrà chiamato
 SHCSELECTOR_TOOLTIP;Click destro per ripristinare la posizione di questi tre cursori.
@@ -1630,6 +1629,7 @@ ZOOMPANEL_ZOOMOUT;Rimpicciolisci.\nScorciatoia: <b>-</b>
 !PREFERENCES_WLONE;One level
 !PREFERENCES_WLTWO;Two levels
 !PREFERENCES_WLZER;No
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !TP_COLORTONING_AB;o C/L
 !TP_COLORTONING_AUTOSAT;Automatic
 !TP_COLORTONING_BALANCE;Balance
diff --git a/rtdata/languages/Japanese b/rtdata/languages/Japanese
index 6aace8da0..df950f230 100644
--- a/rtdata/languages/Japanese
+++ b/rtdata/languages/Japanese
@@ -1117,7 +1117,6 @@ SAVEDLG_SUBSAMP;サブ・サンプリング
 SAVEDLG_SUBSAMP_1;高圧縮
 SAVEDLG_SUBSAMP_2;バランス
 SAVEDLG_SUBSAMP_3;高画質
-SAVEDLG_SUBSAMP_TOOLTIP;高圧縮: 4:1:1\nバランス: 4:2:2\n高画質: 4:4:4
 SAVEDLG_TIFFUNCOMPRESSED;非圧縮 TIFF
 SAVEDLG_WARNFILENAME;ファイルに名前が付けられます
 SHCSELECTOR_TOOLTIP;この3つのスライダーの位置をリセットするには\nマウスの右ボタンをクリック
@@ -1950,6 +1949,7 @@ ZOOMPANEL_ZOOMOUT;ズームアウト\nショートカット: <b>-</b>
 !HISTORY_MSG_425;Retinex - Log base
 !HISTORY_MSG_426;Retinex - Hue equalizer
 !PARTIALPASTE_RETINEX;Retinex
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !TP_RETINEX_CONTEDIT_HSL;Histogram equalizer HSL
 !TP_RETINEX_CONTEDIT_LAB;Histogram equalizer L*a*b*
 !TP_RETINEX_CONTEDIT_LH;Hue equalizer
diff --git a/rtdata/languages/Latvian b/rtdata/languages/Latvian
index 9c0325960..43af1401e 100644
--- a/rtdata/languages/Latvian
+++ b/rtdata/languages/Latvian
@@ -1211,7 +1211,7 @@ TP_WBALANCE_TEMPERATURE;Temperatūra
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_TIFFUNCOMPRESSED;Uncompressed TIFF
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
diff --git a/rtdata/languages/Magyar b/rtdata/languages/Magyar
index c839cf6a1..b6e469126 100644
--- a/rtdata/languages/Magyar
+++ b/rtdata/languages/Magyar
@@ -1368,7 +1368,7 @@ ZOOMPANEL_ZOOMOUT;Kicsinyítés <b>-</b>
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
 !THRESHOLDSELECTOR_BL;Bottom-left
diff --git a/rtdata/languages/Nederlands b/rtdata/languages/Nederlands
index acee00564..4477b85ea 100644
--- a/rtdata/languages/Nederlands
+++ b/rtdata/languages/Nederlands
@@ -1001,7 +1001,6 @@ SAVEDLG_SUBSAMP;Subsampling
 SAVEDLG_SUBSAMP_1;Beste compressie
 SAVEDLG_SUBSAMP_2;Gebalanceerd
 SAVEDLG_SUBSAMP_3;Beste kwaliteit
-SAVEDLG_SUBSAMP_TOOLTIP;Beste Compressie: 4:1:1\nGebalanceerd: 4:2:2\nBeste kwaliteit: 4:4:4
 SAVEDLG_TIFFUNCOMPRESSED;Geen compressie
 SAVEDLG_WARNFILENAME;Bestandsnaam wordt
 SHCSELECTOR_TOOLTIP;Klik op de rechtermuisknop om\nde 3 knoppen te verschuiven
@@ -1824,6 +1823,7 @@ ZOOMPANEL_ZOOMOUT;Zoom uit\nSneltoets: <b>-</b>
 !PREFERENCES_SERIALIZE_TIFF_READ;Tiff Read Settings
 !PREFERENCES_SERIALIZE_TIFF_READ_LABEL;Serialize read of tiff files
 !PREFERENCES_SERIALIZE_TIFF_READ_TOOLTIP;When working with folders full of uncompressed tiff files enabling this option can increase performance of thumb generation.
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !TP_CROP_GTHARMMEANS;Harmonic Means
 !TP_CROP_GTTRIANGLE1;Golden Triangles 1
 !TP_CROP_GTTRIANGLE2;Golden Triangles 2
diff --git a/rtdata/languages/Norsk BM b/rtdata/languages/Norsk BM
index 484726184..e890ded2b 100644
--- a/rtdata/languages/Norsk BM	
+++ b/rtdata/languages/Norsk BM	
@@ -1210,7 +1210,7 @@ TP_WBALANCE_TEMPERATURE;Temperatur
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_TIFFUNCOMPRESSED;Uncompressed TIFF
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
diff --git a/rtdata/languages/Polish b/rtdata/languages/Polish
index ff1ff0fbf..9bb20486b 100644
--- a/rtdata/languages/Polish
+++ b/rtdata/languages/Polish
@@ -908,7 +908,6 @@ SAVEDLG_SUBSAMP;Subsampling
 SAVEDLG_SUBSAMP_1;Najlepsza kompresja
 SAVEDLG_SUBSAMP_2;Pomiędzy
 SAVEDLG_SUBSAMP_3;Najlepsza jakość
-SAVEDLG_SUBSAMP_TOOLTIP;Najlepsza kompresja: 4:1:1\nPomiędzy: 4:2:2\nNajlepsza jakość: 4:4:4
 SAVEDLG_TIFFUNCOMPRESSED;Nieskompresowany TIFF
 SAVEDLG_WARNFILENAME;Plik zostanie nazwany
 SHCSELECTOR_TOOLTIP;Kliknij prawym przyciskiem myszki aby zresetować poycję trzech suwaków.
@@ -1715,6 +1714,7 @@ ZOOMPANEL_ZOOMOUT;Oddal\nSkrót: <b>-</b>
 !PREFERENCES_WLONE;One level
 !PREFERENCES_WLTWO;Two levels
 !PREFERENCES_WLZER;No
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !TP_CROP_GTHARMMEANS;Harmonic Means
 !TP_CROP_GTTRIANGLE1;Golden Triangles 1
 !TP_CROP_GTTRIANGLE2;Golden Triangles 2
diff --git a/rtdata/languages/Polish (Latin Characters) b/rtdata/languages/Polish (Latin Characters)
index 99417bd29..da541f707 100644
--- a/rtdata/languages/Polish (Latin Characters)	
+++ b/rtdata/languages/Polish (Latin Characters)	
@@ -908,7 +908,6 @@ SAVEDLG_SUBSAMP;Subsampling
 SAVEDLG_SUBSAMP_1;Najlepsza kompresja
 SAVEDLG_SUBSAMP_2;Pomiedzy
 SAVEDLG_SUBSAMP_3;Najlepsza jakosc
-SAVEDLG_SUBSAMP_TOOLTIP;Najlepsza kompresja: 4:1:1\nPomiedzy: 4:2:2\nNajlepsza jakosc: 4:4:4
 SAVEDLG_TIFFUNCOMPRESSED;Nieskompresowany TIFF
 SAVEDLG_WARNFILENAME;Plik zostanie nazwany
 SHCSELECTOR_TOOLTIP;Kliknij prawym przyciskiem myszki aby zresetowac poycje trzech suwakow.
@@ -1715,6 +1714,7 @@ ZOOMPANEL_ZOOMOUT;Oddal\nSkrot: <b>-</b>
 !PREFERENCES_WLONE;One level
 !PREFERENCES_WLTWO;Two levels
 !PREFERENCES_WLZER;No
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !TP_CROP_GTHARMMEANS;Harmonic Means
 !TP_CROP_GTTRIANGLE1;Golden Triangles 1
 !TP_CROP_GTTRIANGLE2;Golden Triangles 2
diff --git a/rtdata/languages/Portugues (Brasil) b/rtdata/languages/Portugues (Brasil)
index adca3199a..916d0b40c 100644
--- a/rtdata/languages/Portugues (Brasil)	
+++ b/rtdata/languages/Portugues (Brasil)	
@@ -1211,7 +1211,7 @@ TP_WBALANCE_TEMPERATURE;Temperatura
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_TIFFUNCOMPRESSED;Uncompressed TIFF
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
diff --git a/rtdata/languages/Russian b/rtdata/languages/Russian
index 26f6aa811..03e6e0cc5 100644
--- a/rtdata/languages/Russian
+++ b/rtdata/languages/Russian
@@ -835,7 +835,6 @@ SAVEDLG_SUBSAMP;Субдискретизация
 SAVEDLG_SUBSAMP_1;Лучшая компрессия
 SAVEDLG_SUBSAMP_2;Сбалансированно
 SAVEDLG_SUBSAMP_3;Лучшее качество
-SAVEDLG_SUBSAMP_TOOLTIP;Лучшая компрессия: 4:1:1\nСбалансированно: 4:2:2\nЛучшее качество: 4:4:4
 SAVEDLG_TIFFUNCOMPRESSED;Несжатый TIFF
 SAVEDLG_WARNFILENAME;Файл будет назван
 SHCSELECTOR_TOOLTIP;Нажмите правую кнопку мыши для сброса позиции этих трех ползунков.
@@ -1587,6 +1586,7 @@ ZOOMPANEL_ZOOMOUT;Удалить <b>-</b>
 !PREFERENCES_WLONE;One level
 !PREFERENCES_WLTWO;Two levels
 !PREFERENCES_WLZER;No
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !TP_BWMIX_SET_RGBABS;Absolute RGB
 !TP_BWMIX_SET_RGBREL;Relative RGB
 !TP_BWMIX_SET_ROYGCBPMABS;Absolute ROYGCBPM
diff --git a/rtdata/languages/Serbian (Cyrilic Characters) b/rtdata/languages/Serbian (Cyrilic Characters)
index c94c9dea8..b344bca1b 100644
--- a/rtdata/languages/Serbian (Cyrilic Characters)	
+++ b/rtdata/languages/Serbian (Cyrilic Characters)	
@@ -1308,7 +1308,7 @@ ZOOMPANEL_ZOOMOUT;Умањује приказ слике <b>-</b>
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
 !THRESHOLDSELECTOR_BL;Bottom-left
diff --git a/rtdata/languages/Serbian (Latin Characters) b/rtdata/languages/Serbian (Latin Characters)
index 75e1e8d9f..6c2d068cf 100644
--- a/rtdata/languages/Serbian (Latin Characters)	
+++ b/rtdata/languages/Serbian (Latin Characters)	
@@ -1308,7 +1308,7 @@ ZOOMPANEL_ZOOMOUT;Umanjuje prikaz slike <b>-</b>
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
 !THRESHOLDSELECTOR_BL;Bottom-left
diff --git a/rtdata/languages/Slovak b/rtdata/languages/Slovak
index f496e9bcc..6647cb851 100644
--- a/rtdata/languages/Slovak
+++ b/rtdata/languages/Slovak
@@ -1251,7 +1251,7 @@ ZOOMPANEL_ZOOMOUT;Oddialiť <b>-</b>
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
 !THRESHOLDSELECTOR_BL;Bottom-left
diff --git a/rtdata/languages/Suomi b/rtdata/languages/Suomi
index 6a473fe39..72b3e839a 100644
--- a/rtdata/languages/Suomi
+++ b/rtdata/languages/Suomi
@@ -1212,7 +1212,7 @@ TP_WBALANCE_TEMPERATURE;Lämpötila [K]
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
 !THRESHOLDSELECTOR_BL;Bottom-left
diff --git a/rtdata/languages/Swedish b/rtdata/languages/Swedish
index fef6467e2..6e885c0bd 100644
--- a/rtdata/languages/Swedish
+++ b/rtdata/languages/Swedish
@@ -1039,7 +1039,6 @@ SAVEDLG_SAVESPP;Spara behandlingsparametrarna med bilderna
 SAVEDLG_SUBSAMP_1;Högsta komprimering
 SAVEDLG_SUBSAMP_2;Balanserad
 SAVEDLG_SUBSAMP_3;Högsta kvalitet
-SAVEDLG_SUBSAMP_TOOLTIP;Högsta komprimering: 4:1:1\nBalanserad: 4:2:2\nHögsta kvalitet: 4:4:4
 SAVEDLG_TIFFUNCOMPRESSED;Okomprimerad TIFF
 SAVEDLG_WARNFILENAME;Filen kommer att heta
 SHCSELECTOR_TOOLTIP;Klicka på höger musknapp för att återställa\nde tre reglagens positioner
@@ -1790,6 +1789,7 @@ ZOOMPANEL_ZOOMOUT;Förminska.\nKortkommando: <b>-</b>
 !PREFERENCES_MIN;Mini (100x115)
 !PREFERENCES_SIMPLAUT;Tool mode
 !PREFERENCES_TINB;Number of tiles
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !TP_COLORTONING_CURVEEDITOR_CL_TOOLTIP;Chroma opacity as a function of luminance oC=f(L)
 !TP_COLORTONING_LABEL;Color Toning
 !TP_COLORTONING_LAB;L*a*b* blending
diff --git a/rtdata/languages/Turkish b/rtdata/languages/Turkish
index 17927e003..dc5eec2d9 100644
--- a/rtdata/languages/Turkish
+++ b/rtdata/languages/Turkish
@@ -1211,7 +1211,7 @@ TP_WBALANCE_TEMPERATURE;Isı
 !SAVEDLG_SUBSAMP_1;Best compression
 !SAVEDLG_SUBSAMP_2;Balanced
 !SAVEDLG_SUBSAMP_3;Best quality
-!SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+!SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 !SAVEDLG_WARNFILENAME;File will be named
 !SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
 !THRESHOLDSELECTOR_BL;Bottom-left
diff --git a/rtdata/languages/default b/rtdata/languages/default
index c7965d9ef..4732fe173 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -1107,7 +1107,7 @@ SAVEDLG_SUBSAMP;Subsampling
 SAVEDLG_SUBSAMP_1;Best compression
 SAVEDLG_SUBSAMP_2;Balanced
 SAVEDLG_SUBSAMP_3;Best quality
-SAVEDLG_SUBSAMP_TOOLTIP;Best compression: 4:1:1\nBalanced: 4:2:2\nBest quality: 4:4:4
+SAVEDLG_SUBSAMP_TOOLTIP;Best compression:\nJ:a:b 4:2:0\nh/v 2/2\nChroma halved horizontally and vertically.\n\nBalanced:\nJ:a:b 4:2:2\nh/v 2/1\nChroma halved horizontally.\n\nBest quality:\nJ:a:b 4:4:4\nh/v 1/1\nNo chroma subsampling.
 SAVEDLG_TIFFUNCOMPRESSED;Uncompressed TIFF
 SAVEDLG_WARNFILENAME;File will be named
 SHCSELECTOR_TOOLTIP;Click right mouse button to reset the position of those 3 sliders.
diff --git a/rtgui/main.cc b/rtgui/main.cc
index 5b10dbf7b..bbfca0c52 100644
--- a/rtgui/main.cc
+++ b/rtgui/main.cc
@@ -567,10 +567,13 @@ int processLineParams( int argc, char **argv )
                 std::cout << "                   Preferences > Image Processing > Default Processing Profile" << std::endl;
                 std::cout << "  -j[1-100]        Specify output to be JPEG (on by default). Optionally add" << std::endl;
                 std::cout << "                   compression 1-100 (default value: 92)." << std::endl;
-                std::cout << "  -js<1-3>         Specify the JPEG subsampling parameter, where:" << std::endl;
-                std::cout << "                   1 = Best compression:         2x2, 1x1, 1x1 (4:1:1) - default of the JPEG library" << std::endl;
-                std::cout << "                   2 = Widely used normal ratio: 2x1, 1x1, 1x1 (4:2:2)" << std::endl;
-                std::cout << "                   3 = Best quality:             1x1, 1x1, 1x1 (4:4:4)" << std::endl;
+                std::cout << "  -js<1-3>         Specify the JPEG chroma subsampling parameter, where:" << std::endl;
+                std::cout << "                   1 = Best compression: 2x2, 1x1, 1x1 (4:2:0)" << std::endl;
+                std::cout << "                       Chroma halved vertically and horizontally." << std::endl;
+                std::cout << "                   2 = Balanced:         2x1, 1x1, 1x1 (4:2:2)" << std::endl;
+                std::cout << "                       Chroma halved horizontally." << std::endl;
+                std::cout << "                   3 = Best quality:     1x1, 1x1, 1x1 (4:4:4)" << std::endl;
+                std::cout << "                       No chroma subsampling." << std::endl;
                 std::cout << "  -b<8|16>         Specify bit depth per channel (only applies to TIFF and PNG output)." << std::endl;
                 std::cout << "  -t[z]            Specify output to be TIFF (16-bit if -b8 is not set)." << std::endl;
                 std::cout << "                   Uncompressed by default, or ZIP compression with 'z'" << std::endl;