Ok, so a little research reveals that the problem is much earlier than I
thought: the images I'm creating have no resolution data.
So, the next question is: Given a bunch of bitmap data, and a resolution, how
do I create an NSImage (or CGImage or CGImageSource) with the correct
resolution?
Currently, I'm doing:
CGDataProviderRef provider= CGDataProviderCreateWithData(NULL,
(UInt8*)data, bytesPerRow * length, NULL);
CGImageRef cgImg = CGImageCreate (
width,
length,
bitsPerComponent,
bitsPerPixel,
bytesPerRow,
colorspace,
bitmapinfo, // ? CGBitmapInfo bitmapInfo,
provider, //? CGDataProviderRef provider,
NULL, //const CGFloat decode[],
true, //bool shouldInterpolate,
kCGRenderingIntentDefault // CGColorRenderingIntent intent
);
/* CGColorSpaceRelease(colorspace); */
NSData* imgData = [NSMutableData data];
CGImageDestinationRef dest = CGImageDestinationCreateWithData
(imgData, kUTTypeTIFF, 1, NULL);
CGImageDestinationAddImage(dest, cgImg, NULL);
CGImageDestinationFinalize(dest);
NSImage* img = [[NSImage alloc] initWithData: imgData];
now, it appears that CGImageDestination takes only a NULL argument for the
dictionary.. and width and length are in pixels, not points or inches. At what
point in this process am I supposed to add the resolution into this process?
Brian Postow
Senior Software Engineer
Acordex Imaging Systems
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