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Document negative index pixel access access #10297

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10 changes: 10 additions & 0 deletions docs/handbook/concepts.rst
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Expand Up @@ -95,6 +95,16 @@ Coordinates are usually passed to the library as 2-tuples (x, y). Rectangles
are represented as 4-tuples, (x1, y1, x2, y2), with the upper left corner given
first.

Since Pillow 5.4.0, individual image pixels can be accessed using negative indexes.
For example, to get or set the farthest pixel in the lower right of an image::

>>> from PIL import Image
>>> im = Image.new("RGB", (10, 10), (255, 0, 0))
>>> px = im.load()
>>> px[-1, -1]
(255, 0, 0)
>>> px[-1, -1] = (0, 0, 0)

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