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Hi there!

i’m trying to make the script works on osx. It seems that the test in the rgb2cymk is broken as it uses ==

From what i got from https://www.shellscript.sh/test.html:

Note: Some shells also accept == for string comparison; this is not portable, a single = should be used for strings, or -eq for integers.

So i changed it to = on line 19 and things are better

Thanks for sharing this amazing tool, pretty useful in pagedjs world :)