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Color basics

Pixels

The screen image in Photoshop is a bitmap, which is a geometric arrangement (mapping) of a layer of dots of different shades or colors on a rectangular grid. Each dot, called a pixel, represents a color or shade. By magnifying an area of an image, you can edit pixels individually . Every Photoshop image is a bitmap, whether it originates from a scan, from another application, or entirely within the application using painting and editing tools. (Don't confuse Bitmap image mode with the term "bitmap.") Bitmap programs are ideal for producing painterly, photographic, or photorealistic images that contain subtle gradations of color. If you drag with a painting tool across an area of a layer, pixels under the pointer are recolored.




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