Plan of bits

In Data-processing, a plane of bits of English bitplane is a structure memory which stores only one Bit for each Pixel of a Digital image. It is thus about an image Monochrome but which can be combined with other plans of bits to vary the depth of the image. Thus, the number of bits coding the color of a pixel can be defined finely.

History

This mode was used on the computers Amiga because it has a great flexibility in the occupation memory since the number of bits per pixel is adjusted according to the needs.

This mode of representation is now regarded as obsolete because the depth many bits of the current images (often 24 bits) for which the mode in plan of bits would not be conceivable. Indeed, when many bits are necessary, this system of representation quickly becomes defective because of the number of accesses report necessary to modify a pixel. It is indeed necessary to reach all the plans of bits with masks expensive in term of instructions of the Processeur.

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