http://www.blackfiveservices.co.uk/separate.shtml
Summary:
What can it do?
* Convert an RGB image to individual CMYK layers, using specified source and destination Colour Profiles.
* Save such a collection of layers as a CMYK TIFF.
* Optionally restrict separation of pure black pixels to the black plate (useful for processing flattened PDFs with text).
* Perform a rudimentary background fill-in (Overprint) to accompany the Preserve Pure Black option.
* Proof the CMYK image on the monitor. (This is currently done as an Absolute Colorimetric transform from the
CMYK data back to the RGB profile; it should provide a pretty good side-by-side match with a print.)
* Perform a "duotone" separation on an RGB image, reducing it to just those colours achievable with red and black
ink. (This feature does *not* use colour-profiles!)
What can't it do?
* Load CMYK TIFFs into individual layers. If you want to edit a CMYK image, save it in XCF format as well as
CMYK TIFF, so the layers are preserved for future editing.
* Embed ICC profiles in the generated TIFF.
* Perform the "duotone" trick based on any colour other than red.
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