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If I have an RGB image, I know I can split it into the 3 grey-scale images,
by applying the following AND bitwise masking

int r = (c & 0xff0000) >> 16;

int g = (c & 0xff00) >> 8;

int b = c & 0xff;



If I have an image in CMYK, what is the bitwise AND masking I require to
extract the 4 greyscale images representing one for each colour?

Oracle3001:

>If I have an RGB image, I know I can split it into the 3 grey-scale images,
>by applying the following AND bitwise masking
[...]
>If I have an image in CMYK, what is the bitwise AND masking I require to
>extract the 4 greyscale images representing one for each colour?

That depends on the encoding which was used. Where do you get those
CMYK samples from?

Anyway, you could just try a couple of straight-forward encodings,
e.g.

cyan = (c & 0xff000000) >> 24;
magenta = (c & 0x00ff0000) >> 16;
yellow = (c & 0x0000ff00) >> 8;
black = c & 0xff;

Regards,
Marco
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