This seemed to work in a flash after fruitlessly spending a lot of time wrestling with Gimp/plugins and /plugins. Click the color in the image that you want to replace. Although GIMP has no tool to perform this function automatically, you can do it using a combination of the tools that are available. Step 1: Use aforementioned Select by Color tooling to choose all and pixels containing of color you want for change. Or convert input.png -color-matrix "1.638297872 0 0 0 0.803030303 0 0 0 1.111111111" output.png One of the simplest ways to correct these problems is to have GIMP find all instances of one color and replace it with another. And blue values to be 63/70ths of the current values. It also adds a host of other tooltip options. Green values to be 159/198th of the current values. This mod will allow you to change the tooltips of a selection of items of your choice to embellished works of art. So that means I wanted new pixels' R value to be 231/141ths of the current red value. The rest of the colors wanted to be changed equivalently. Specifically, because I knew a "master color" of the original image (green, in your case and mine) and I knew the "master color" in the desired result image (blue, in your case, orange in mine), I gave ImageMagick' -recolor/-color-matrix option a transformation matrix with values that reflected the differences in each of the RGB channels.įor example, in my case, the fully green color was R:141 G:198 B:63 and I wanted it changed to R:231 G:159 B:70. The different operator is either -recolor or -color-matrix, depending on ImageMagick version. The first successful method I found to do the same sort of thing was to use ImageMagick, but with a different operator than the earlier-suggested -separate/-swap.
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