colorSpace = CGColorSpaceCreateDeviceRGB();
// CGBitmapInfo bitmapInfo = kCGBitmapByteOrder32Little | kCGImageAlphaNoneSkipFirst;
// CGBitmapInfo bitmapInfo = kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst;
//error
CGBitmapInfo bitmapInfo = kCGBitmapByteOrder32Little | kCGImageAlphaNone;
http://lists.apple.com/archives/carbon-dev/2007/Jun/msg00014.html
CGBitmapContextCreate: unsupported parameter combination: set CGBITMAP_CONTEXT_LOG_ERRORS environmental variable to see the details
I am trying to use CGBitmapContextCreate to create a context for a raw
image, but I get this error message:CGBitmapContextCreate: unsupported parameter combination: 8 integer
bits/component; 32 bits/pixel; 3-component colorspace;
kCGImageAlphaFirst.Here is how I create my color space
…
FContext := CGBitmapContextCreate(FBits,
NewWidth, NewHeight, 8, Stride, FColorSpace, kCGImageAlphaFirst or
kCGBitmapByteOrder32Little);…
Any ideas about what is wrong? i looked at CGBitmapContextCreate’s
docs here, but they say that it supports 32-bits images with 8 bits
per channel:
http://developer.apple.com/documentation/GraphicsImaging/Reference/ CGImage/Reference/reference.html#//apple_ref/doc/c_ref/CGBitmapInfo
That just lists possible values for CGBitmapInfo. You should check out http://developer.apple.com/qa/qa2001/qa1037.html>. It lists the only legal combinations of bitsPerComponent, colorspace and bitmapInfo that CGBitmapContextCreate supports. It is a fairly limited set and any other combinations cause CGBitmapContextCreate to fail.
steve
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