Photoshop works with digital images (including digital photos, images that have been digitized with a scanner, and artwork that you create from scratch in Photoshop). The digits are the computer code used to record the image's information. The number of pixels, the color of each pixel, and any associated information are all recorded in a series of zeros and ones on your hard drive. Color, therefore, is nothing more than numbers — at least as far as Photoshop is concerned. For you and me, however, color is far more than binary code on a hard drive. It's the image, the artwork, the message. The artwork is color, and color is the artwork, by pixel.
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