Image File Formats

Image file formats are standardized means of organizing and storing digital images. Image files are composed of digital data in one of these formats that can be rasterized for use on a computer display or printer. An image file format may store data in uncompressed, compressed, or vector formats. Once rasterized, an image becomes a grid of pixels, each of which has a number of bits to designate its color equal to the color depth of the device displaying it.

Read more about Image File Formats:  Image File Sizes, Image File Compression, Major Graphic File Formats

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... Indexed color is a technique to manage image colors in a limited fashion, in order to save RAM and video memory buffer space, file storage space, telecom bandwidth ... A typical 640×480 VGA resolution, truecolor uncompressed image needs 640×480×3 = 921,600 bytes (900 KiB) ... Limiting the image colors to 256, every pixel needs only 8 bits, 1 byte, so the example image now needs only 640×480×1 = 307,200 bytes (300 KiB), plus 256×3 = 768 ...

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