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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]]