On Sun, 2018-04-29 at 07:22 -0500, Frank Turk wrote: > If there was a way to extract the "K" layer in a "CMYK" > image, > it might be easier to grab just the black.
You can use the separate+ plugin to do that, although what people think of as "pure black" for printing is not actually 0 in CMYK value - designers more often specify a rich black, e.g. Adobe Rich Black, whic (depending on the final print medium) might be 0.75, 0.68, 0.67, 0.90 CMYK respectively. There's also undercolour removal and overprinting. For the origial question, i'd probably desaturate and use curves with a very steep slope, the endpoints (bottom and top) close to the middle of the image. I used desaturate, then value propagate (more black, 0.2 or so) to make the lines more robust, then curves, to make http://www.holoweb.net/~liam/download/ankhslave-gimp-original.png The curves looked like this: http://www.holoweb.net/~liam/download/ankhslave-curves.png liam (ankh) -- Liam Quin - web slave for https://www.fromoldbooks.org/ with fabulous vintage art and fascinating texts to read. Click here to have the slave beaten. _______________________________________________ gimp-user-list mailing list List address: gimp-user-list@gnome.org List membership: https://mail.gnome.org/mailman/listinfo/gimp-user-list List archives: https://mail.gnome.org/archives/gimp-user-list