Convert an RGB - Printable Version +- Gimp-Forum.net (https://www.gimp-forum.net) +-- Forum: GIMP (https://www.gimp-forum.net/Forum-GIMP) +--- Forum: General questions (https://www.gimp-forum.net/Forum-General-questions) +--- Thread: Convert an RGB (/Thread-Convert-an-RGB)

Convert an RGB - EOT3000 - 09-29-2020 I have an image, in which parts have a green value of ~70, but I need to make it around 220. How can I multiply the green value in all the pixels on my image by 3? RE: Convert an RGB - Ofnuts - 09-29-2020 Start the Levels tool. Set the Channel selector to "Green" In the Input levels (just below the histogram) drag the rightmost handle to value 85. This will spread the input range 0-85 (85≈256/3) over the 0-255 output range. However this may not be completely valid. If the colors of the darker greens seems to be a bit off: click the "Edit these settings as Curves" button, Set the Channel selector to "Green" Click the middle of the green slope Drag it up or down