Legacy ImageMagick Discussions Archive

tgakic wrote:Hi everyone,

I do try to perform an operation from command line with convert, but I can't get around it, yet. Maybe I overlook the exact keyword in the manual. In that case maybe someone can point it to me...

How do I use the modulate option of the convert to change only one colorspace and not all. For example if I do:

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convert image.png -modulate 100,100,200 modulate.png

I change red in cyan, yellow in blue, etc. But what if I only want to change only cyan in red, not the other colors? I have try to use

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-set option:modulate:colorspace cyan

and similar, but it will not work.

I found a way to do it using gimp [1], but I would like to use a command line tool, like convert to do this. Any ideeas?

Thank you.

Ionel

[1] Colors -> Hue-Saturation... -> C -> Hue at 180

fmw42 wrote: You have posted to the wrong forum. Please use the ImageMagick forum at the top.

fmw42 wrote: If you want to convert one range of hues to another range of hues, see my unix/bash script, huemap, at the link below.

./huemap -h 180,0 -t 30,30 imagein imageout