Depending on what type of graphics editing progam you have (I use MS Picture It! and PSP7... I know both outdated, but, I'm used to them...)...
Open the gradiant in the program, then using colorize, or 'adjust' the luminence/brightness/hue, etc. or another way in PSP is to open it and if you have the color scheme you want to use already saved as a palette you can then just load the palette and that will change the gradiant image.
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