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Questions tagged [channel]

Questions about using separations of colors in digital images.

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Gimp Python-Fu how to copy a channel

Suppose I want to copy the red channel of an image (thus creating a new channel). How do I do that with Python-Fu? EDIT: basically, I need to create luminosity masks. So far, I tryed the following ...
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How can I compare alpha channels pixel by pixel?

I've got two TIFF files with RGB and multiple alpha channels. The RGB channels are pixel by pixel identical. The alpha channels have values from 0 to 255. How can I compare an alpha channel in each ...
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Duotone psd file for (offset) printing

I read that answers at this question: Preparing design for duotone printing? I need it to be more specific about the step: use the complementary RGB channel, in this case Red (E) Play with the ...
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In a CMYK raster image, why does pure black look darker if I switch off other 3 channels?

File mode: CMYK CMYK working profile: Fogra 39 Grayscale working profile: Dot gain 15% Any region with pure black (0 0 0 100), if I turn off the cyan, magenta and yellow channels, it gets slightly ...