Background gradient mask layer effect

Question

I'm a newbie using gimp. I would like to make a banner like the picture below, a white color banner with some fade background color. Please advise. Thanks.

Answer 1

There may be scripts to do it but it can be done manually

• Get a selection on the light color (that can be the one you just used to bucket-fill)
• Select>Save to channel to save the selection
• Select>Invert
• Select>Grow and grow it by the width of the fade you want
• Select>Feather by the double of the value above: you know have a selection that fades out starting on the border
• Open the Channels list, right click the Selection mask copy and Intersect with selection: so you only keep the fading part of that selection.
• Important: in the Layers list, select your layer again
• Bucket-fill the selection with the darker color