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paag:bitmap_and_bitdepth [2019/04/07 10:56] |
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+ | [{{ paag_bitmap_and_bitdepth.png|a) 1bpp\\ b) 2bpp\\ c) 2bpp wide pixels\\ d) shared palette}}] A **bitmap** is literally a map containing bits, just zeroes and ones. How the bits are interpreted ("mapped to" a visual image) depends entirely on the [[graphic_mode|graphic mode]] used to display the bits. | ||
+ | The **bitdepth** of a mode refers to how many bits are used to define the information for a single pixel in the bitmap. | ||
+ | |||
+ | The short notation to describe the bitdepth of a digital image/bitmap is bpp (bits per pixel). | ||
+ | |||
+ | In an indexed image, the bitdepth directly defines the maximum number of different colors any pixel can be: It is "two to the power of bpp", provided the palette contains that many distinct colors. | ||
+ | |||
+ | All three modes in the example here use an identical bitmap. | ||
+ | |||
+ | further reading: | ||
+ | * [[wp>Bitmap]] | ||
+ | * [[wp>Raster_graphics|Raster Graphics]] |