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I need to convert some stock icon imagery to a pre-existing colour scheme. The method for conversion is to simply adjust the image hue to the right level.

However all I have to go on is existing imagery that has already undergone the process. As such, I know that the muddy green of 99b963 should become the dull mauve of 7763b9.

My current method is trial and error: I zoom in to an area of green, overlay a layer featuring an adjacent pixel of the target mauve, select the original layer, then adjust saturation until it looks right. At that point I step out of the adjustment dialogue, get the color picker out, and compare. Repeat until just right.

Does Photoshop / Gimp / Paint.NET have a simpler, procedural method for achieving this, in 1 step if possible? If not, is there a less trial-and-error method to achieve the right hue given a target colour difference?

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It's difficult for me to understand what problem you need to solve. Could you add some example imagary of what should get transformed into what? –  John May 21 '13 at 16:13
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1 Answer 1

Does the "Replace Color" feature in Photoshop solve your problem?

Image > Adjustments > Replace Color

There you can select a color with the eyedropper which is then also displayed under the "Replacement" section. If you click on the color rectangle in this section the color picker dialog opens and you can specify a desired hue.

Adjust the effect with the "Fuzziness" slider.

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I would say this is the best way to do it. Although it's not very exact most of the time, unfortunately. @Barney, alternatively, you might try to have a layer with a dot of the desired color next to what you want to change, then change the hue until it seems the right colour. –  poepje May 26 '13 at 22:39
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