You can do it before or after. But, if you do it after, you may have a few quirks to work around. You simply increase your canvas size to a popular size (800x600, 1024x768, 1600x1200). Then you will need to add a background or fill in the existing background. For example, the current project is a collection of layers. Each layer has an image. Then I added a background layer which I can choose my color, gradient, pic, or whatever. With one click of a button, I can change the color.
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