I tried to find how to change color of text for each character (not only their names, but text itself) but found in documentation only something like. Here is a guide if you ever want to know the full color name based on the color code. This will prevent gamma shift in browsers.
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Continuous color selection tool will come in handy;
Of course it all comes down to how exactly the source image.
Then you can just use fill tool and put a different color there. Select the color that you want to remove as color 2, go to the selection tool and enable transparent selection (it is a legacy feature from before transparency), then ctrl+a to select all. Hello, i need your help.