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Document pixel range (#3826)

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Document pixel range
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docs/handbook/concepts.rst
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@ -24,8 +24,10 @@ To get the number and names of bands in an image, use the
Modes
-----
The ``mode`` of an image defines the type and depth of a pixel in the
image. The current release supports the following standard modes:
The ``mode`` of an image defines the type and depth of a pixel in the image.
Each pixel uses the full range of the bit depth. So a 1-bit pixel has a range
of 0-1, an 8-bit pixel has a range of 0-255 and so on. The current release
supports the following standard modes:
* ``1`` (1-bit pixels, black and white, stored with one pixel per byte)
* ``L`` (8-bit pixels, black and white)