Hi
I'm trying to write an NSImage category that converts an image to cmyk . It
sort of works, in that it does produce a new image, but all images have a dark
green cast to them and look sort of solarized or like negatives. Anyone point
out what I'm doing wrong?
Thanks for any help
- (NSImage *) cmykImage
{
NSImage *result = [[NSImage alloc]
initWithSize: [self size]];
NSBitmapImageRep *rep = [[NSBitmapImageRep
alloc]
initWithBitmapDataPlanes: NULL
pixelsWide: [self size].width
pixelsHigh: [self size].height
bitsPerSample: 8
samplesPerPixel: 4
hasAlpha: NO
isPlanar: NO
colorSpaceName: NSDeviceCMYKColorSpace
bytesPerRow: 0
bitsPerPixel: 0];
NSGraphicsContext *context = [NSGraphicsContext
graphicsContextWithBitmapImageRep: rep];
[NSGraphicsContext setCurrentContext: context];
[context setImageInterpolation: NSImageInterpolationHigh];
[self compositeToPoint: NSZeroPoint operation: NSCompositeSourceOver];
[result addRepresentation: rep];
return result;
}_______________________________________________
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