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