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Click the "upload file" link in the menu to the left. Follow the instructions to upload the file. It's the same procedure as most websites, although we only accept "freely licensed" images. If you're not sure that your file is freely licensed, please only upload it if you took the photo yourself.
Basics of image editing. Raster images are stored in a computer in the form of a grid of picture elements, or pixels. These pixels contain the image's color and brightness information. Image editors can change the pixels to enhance the image in many ways. The pixels can be changed as a group, or individually, by the sophisticated algorithms ...