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paag:bitmap_and_bitdepth [2019/04/07 10:56]
paag:bitmap_and_bitdepth [2019/04/07 10:56] (current)
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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]]
paag/bitmap_and_bitdepth.txt ยท Last modified: 2019/04/07 10:56 (external edit)