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Photo and imaging software is used to edit and compose raster images; Adobe Photoshop, which dominates the market, has its own topic. Common actions include cropping, slicing, retouching, color replacement, masking and erasing. Other programs include Apple Photo, Corel PaintShop Pro, GIMP, Serif PhotoPlus, Pixlr, PhotoScape, Picasa and IrfanView.
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for creating GIFs: what OS do you use (mac/pc/android)?
EDIT:
GIMP has a steep learning curve, but there are versions for Unix/Mac/Windows