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+--- Thread: How do I exchange colors? (/Thread-How-do-I-exchange-colors)
How do I exchange colors? - odastein - 11-24-2018
Hello,
Keep in mind that it's the first time ever that I'm using GIMP; so I've no clue how one would routinely use any basic function.
So, I want to change the color of pixels in an area of a picture from some kind of brown/purple to black. I selected the area. I opened color/map/exchange color. I selected a sample pixel of the color I want to change to black in "from color". Black is already preselected in "target color" by default.
Then, what do I do to actually exchange the colors? I clicked on "apply" but the "exchange color" window just closed and nothing happened in my selection. The manual explain explains how to select the origin and target colors, as I wrote above but doesn't say how you actually apply the change.
Thanks in advance.
RE: How do I exchange colors? - Ofnuts - 11-25-2018
In practice you have to increase the thresholds for the RGB channels. In a regular image, very few pixels are exactly of a given color, so unless you give some margin very few pixels will be affected by the change.
This said I 've been using Gimp for a while now and I don't remember using color exchange, to there are possibly other/better ways to do what you want. what are you trying to achieve?