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CMYK Conversion


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This is mainly directed towared boltbait. I looked on your website and viewed your cmyk plugin and gave it a try. I was going to just suggest something I found on gimp. I have no idea if it is feasible or anything. The website below had a very good cmyk conversion plugin that basically makes the image unchanged as far as appearance is concerned. The website is:

http://plasticbugs.com/?p=361

There are two different plugins mentioned there; apparently one is better than the other. Like I said, it may not be usable at all, but I figured it was worth looking at. If anyone else knows more, I would be interested.

"He is no fool who gives what he cannot keep to gain that which he cannot lose."

-Jim Elliot

John 3:36

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It is impossible to convert from RGB to CMYK and have the image unchanged. Certain colors in RGB do not exist in CMYK. For example Blue (#0000FF) does not exist in CMYK.

I think that the implementation that I did gives a fairly accurate representation of what the image will look like when printed.

The only thing I can think is that they are doing some type of dithering... my effect is pixel-by-pixel translation. If they are using a dithering technique, it may be possible to get a more accurate color representation. However, this would not be a strict RGB to CMYK conversion.

Click to play:
j.pngs.pngd.pnga.pngp.png
Download: BoltBait's Plugin Pack | CodeLab | and how about a Computer Dominos Game

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From my reading, I found the same as what you said, that the cmyk spectrum simply cannot reproduce exactly what rgb produces, especially in blues. I just thought, seeing the source codes for those converters is available, it may be possible to implement something from them that has made those converters appear successful.

"He is no fool who gives what he cannot keep to gain that which he cannot lose."

-Jim Elliot

John 3:36

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