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Gimp gradient modes8/12/2023 ![]() ![]() This seemed to work in a flash after fruitlessly spending a lot of time wrestling with Gimp/plugins and /plugins. Make a selection that covers the gradient area fairly accurately. Or convert input.png -color-matrix "1.638297872 0 0 0 0.803030303 0 0 0 1.111111111" output.png Add an alpha channel to the layer, if it hasnt already got one. And blue values to be 63/70ths of the current values. The layer mask is made active by clicking on its thumbnail in the Layers dialog. Green values to be 159/198th of the current values. 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. Right click on your layer and make sure that Edit Layer Mask is selected. You should see a white box show up next to the thumbnail of your image in the Layers menu. Make sure White (full opacity) is selected and click Add. In the Gimp 2.10 UI, the Blend tool and many others remain active because you can edit your settings while applying the tool (in the Blend tool, you can move the endpoints, and even adjust the gradient). 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. And a gradient may be applied to selections or opacities. In the Layers menu, right click on the layer and select Add Layer Mask. 1 From this point, if I select none, the gradient no longer sits in my rectangle selection, but is applied to the entire image. The different operator is either -recolor or -color-matrix, depending on ImageMagick version. Right-click on this to bring up the Pop. 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. When you click the Create a new gradient button the Gradient Editor will give you a gray scale gradient to start with. ![]()
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