Fixes to Color Balance node:

* The Lift/Gamma/Gain formula previously was incorrect, fixed this and 
removed conversions - now the RNA values are the same as what goes into 
the formula.
* Because of this, added the ability for the Value slider to map to a wider range 
than 0.0-1.0. The black/white gradient remains the same, in this case just 
indicating darker/brighter rather than absolute colour values. Also added ability 
for color wheels to be locked at full brightness (useful for this case, where the 
color value itself is dark).
* Added an alternate formula - offset/power/slope (asc-cdl). This fits the standard 
Color Decision List formula, here for compatibility with other systems, though 
default Lift/Gamma/Gain is easier to use and gives nicer results.

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/editors/interface/interface_handlers.c b/source/blender/editors/interface/interface_handlers.c
index b84bdcd958e..bb3709295f8 100644
--- a/source/blender/editors/interface/interface_handlers.c
+++ b/source/blender/editors/interface/interface_handlers.c
@@ -2872,10 +2872,18 @@ static int ui_numedit_but_HSVCUBE(uiBut *but, uiHandleButtonData *data, int mx,
 		hsv[2]= x; 
 	}
 	else if (but->a1==9){
+		float range;
+		
 		/* vertical 'value' strip */
 		hsv[2]= y; 
+		
+		/* exception only for value strip - use the range set in but->min/max */
+		range = but->softmax - but->softmin;
+		hsv[2] = y*range + but->softmin;
+		
 		if (color_profile)
 			hsv[2] = srgb_to_linearrgb(hsv[2]);
+		
 	}
 
 	hsv_to_rgb(hsv[0], hsv[1], hsv[2], rgb, rgb+1, rgb+2);