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Grokking The Gimp
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Notes on Video RAM

The ability to display large images on a video monitor depends on the amount of video RAM available on the video card. For example, if the display resolution is $1024\times 768$ with only 8 bits  (1 byte) of color per pixel, the minimum required amount of video RAM is 0.79 Mb. However, working with only 8 bits per pixel is paltry, because it only allows for 256 simultaneous colors on the screen at one time.

Increasing the color depth to 16 bits  (2 bytes) at a resolution of $1024\times 768$ doubles the required video RAM to 1.57 Mb. This is really the minimum video RAM required to get reasonable performance from the GIMP, and a higher-performance system might have a resolution of $1600\times 1200$ with 24 bits  (3 bytes) of color per pixel, requiring at least 5.76 Mb of video RAM.

Grokking The Gimp
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