(This was originally posted to the Colorsync-dev list about three weeks ago
without any activity on the list, so I'm hoping that someone here can help)
I have an app that is essentially creating a single resultant image from an
amalgamation of multiple source images. Each source image is an NSImage that
has a single NSBitmapImageRep which carries with it color profile data in its
NSImageColorSyncProfileData property.
The effective algorithm is:
NSBitmapImageRep* getBitmapOfImages(NSArray* imagesArray, NSSize
bitmapSize)
{
NSBitmapImageRep* bitmap = [[[NSBitmapImageRep alloc]
initWithBitmapDataPlanes: NULL
pixelsWide: bitmapSize.width
pixelsHigh: bitmapSize.height
bitsPerSample: 8
samplesPerPixel: 4
hasAlpha: YES
isPlanar: NO
colorSpaceName: NSCalibratedRGBColorSpace
bytesPerRow: 0
bitsPerPixel: 0] autorelease];
NSGraphicsContext* bitmapGraphicsContext = [NSGraphicsContext
graphicsContextWithBitmapImageRep:bitmap];
NSGraphicsContext* originalGraphicsContext = [NSGraphicsContext
currentContext];
[NSGraphicsContext setCurrentContext:bitmapGraphicsContext];
for (NSImage* image in imagesArray)
{
NSRect imageRect = /* calculate rect for particular
source image */;
[image drawInRect:imageRect ...];
}
[NSGraphicsContext setCurrentContext:originalGraphicsContext];
return bitmap;
}
The issue I am experiencing is that the color of the resultant image generated
by my application when printed does not match the color of the source image
when printed from another application (which is in this case Aperture).
What attributes do I need to use when creating the destination bitmap so that
the color of each source image is rendered properly for that source image when
the destination image is printed? Or is there a deeper issue that I am not
addressing here?
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