Complete List of Supported Quartz Bitmap Content Formats as of Tiger

Pixel Format	Bits per Component	Bits per Pixel	Bitmap Info Value	Color Space	Available Starting in Mac OS X
1-component, 8-bit data, no alpha: GGGG…	8	8	kCGImageAlphaNone	Gray	10.0
3-component, 16-bit data, no alpha, 1 leading padding bit: XRGBXRGB…	5	16	kCGImageAlphaNoneSkipFirst	RGB	10.0
3-component, 32-bit data, no alpha, 1 leading padding byte: XRGBXRGB…	8	32	kCGImageAlphaNoneSkipFirst	RGB	10.0
3-component, 32-bit data, no alpha, 1 trailing padding byte: RGBXRGBX…	8	32	kCGImageAlphaNoneSkipLast	RGB	10.0
3-component, 32-bit data with leading premultiplied alpha byte: ARGBARGB…	8	32	kCGImageAlphaPremultipliedFirst	RGB	10.0
3-component, 32-bit data with trailing premultiplied alpha byte: RGBARGBA…	8	32	kCGImageAlphaPremultipliedLast	RGB	10.0
4-component, 32-bit data with no alpha, no padding bits: CMYKCMYK…	8	32	kCGImageAlphaNone	CMYK	10.3
1-component, 8-bit alpha only: AAAA…	8	8	kCGImageAlphaOnly	NULL	10.3
1-component, 32-bit floating-point data per component with no alpha, no padding bits: GGGG…	32	32	kCGImageAlphaNone | kCGBitmapFloatComponents	Gray	10.4
3-component, 32-bit floating-point data per component, with no alpha, 4 trailing padding bytes: RGBXRGBX…	32	128	kCGImageAlphaNoneSkipLast | kCGBitmapFloatComponents	RGB	10.4
3-component, 32-bit floating-point data per component, with trailing premultiplied alpha: RGBARGBA…	32	128	kCGImageAlphaPremultiplied- Last | kCGBitmapFloatComponents	RGB	10.4
4-component, 32-bit floating-point data per component, with no alpha, no padding bits: CMYKCMYK…	32	128	kCGImageAlphaNone | kCGBitmapFloatComponents	CMYK	10.4