Revision: 12541
http://sourceforge.net/p/skim-app/code/12541
Author: hofman
Date: 2021-11-09 22:27:40 +0000 (Tue, 09 Nov 2021)
Log Message:
-----------
Use different color invert matrix, based on inverting just a linear luminocity
value
Modified Paths:
--------------
trunk/NSGraphics_SKExtensions.m
Modified: trunk/NSGraphics_SKExtensions.m
===================================================================
--- trunk/NSGraphics_SKExtensions.m 2021-11-09 10:09:07 UTC (rev 12540)
+++ trunk/NSGraphics_SKExtensions.m 2021-11-09 22:27:40 UTC (rev 12541)
@@ -184,6 +184,10 @@
#pragma mark -
+#define LR 0.3086 * 1.987
+#define LG 0.6094 * 1.987
+#define LB 0.0820 * 1.987
+
extern NSArray *SKColorEffectFilters(void) {
NSMutableArray *filters = [NSMutableArray array];
CIFilter *filter;
@@ -193,9 +197,10 @@
[filters addObject:filter];
}
if (SKHasDarkAppearance(NSApp) && [[NSUserDefaults standardUserDefaults]
boolForKey:SKInvertColorsInDarkModeKey]) {
- // this is almost equivalent to CIColorInvert, but with white mapped
to dark gray ~ controlBackgroundColor
- // combined with a matrix representation of CIHueAdjust with
inpueAngle=M_PI
- if ((filter = [CIFilter filterWithName:@"CIColorMatrix"
keysAndValues:@"inputRVector", [CIVector vectorWithX:0.566538 Y:-1.411410
Z:-0.142128], @"inputGVector", [CIVector vectorWithX:-0.420462 Y:-0.424410
Z:-0.142128], @"inputBVector", [CIVector vectorWithX:-0.420462 Y:-1.41141
Z:0.844872], @"inputBiasVector", [CIVector vectorWithX:1.0 Y:1.0 Z:1.0], nil]))
+ // This is like CIColorInvert + CIHueAdjust, modified to map white to
dark gray rather than black
+ // Inverts a linear luminocity/brightness for weights 0.3086, 0.6094,
0.0820
+ // see
https://wiki.preterhuman.net/Matrix_Operations_for_Image_Processingand
https://beesbuzz.biz/code/16-hsv-color-transforms
+ if ((filter = [CIFilter filterWithName:@"CIColorMatrix"
keysAndValues:@"inputRVector", [CIVector vectorWithX:1.0-LR Y:-LG Z:-LB],
@"inputGVector", [CIVector vectorWithX:-LR Y:1.0-LG Z:-LB], @"inputBVector",
[CIVector vectorWithX:-LR Y:-LG Z:1.0-LB], @"inputBiasVector", [CIVector
vectorWithX:1.0 Y:1.0 Z:1.0], nil]))
[filters addObject:filter];
}
return filters;
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