mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-12-27 18:36:17 +03:00
90 lines
2.6 KiB
ReStructuredText
90 lines
2.6 KiB
ReStructuredText
.. _PixelAccess:
|
|
|
|
:py:class:`PixelAccess` Class
|
|
=============================
|
|
|
|
The PixelAccess class provides read and write access to
|
|
:py:class:`PIL.Image` data at a pixel level.
|
|
|
|
.. note:: Accessing individual pixels is fairly slow. If you are
|
|
looping over all of the pixels in an image, there is likely
|
|
a faster way using other parts of the Pillow API.
|
|
|
|
:mod:`~PIL.Image`, :mod:`~PIL.ImageChops` and :mod:`~PIL.ImageOps`
|
|
have methods for many standard operations. If you wish to perform
|
|
a custom mapping, check out :py:meth:`~PIL.Image.Image.point`.
|
|
|
|
Example
|
|
-------
|
|
|
|
The following script loads an image, accesses one pixel from it, then
|
|
changes it.
|
|
|
|
.. code-block:: python
|
|
|
|
from PIL import Image
|
|
|
|
with Image.open("hopper.jpg") as im:
|
|
px = im.load()
|
|
print(px[4, 4])
|
|
px[4, 4] = (0, 0, 0)
|
|
print(px[4, 4])
|
|
|
|
Results in the following::
|
|
|
|
(23, 24, 68)
|
|
(0, 0, 0)
|
|
|
|
Access using negative indexes is also possible.
|
|
|
|
.. code-block:: python
|
|
|
|
px[-1, -1] = (0, 0, 0)
|
|
print(px[-1, -1])
|
|
|
|
|
|
|
|
:py:class:`PixelAccess` Class
|
|
-----------------------------
|
|
|
|
.. class:: PixelAccess
|
|
|
|
.. method:: __setitem__(self, xy, color):
|
|
|
|
Modifies the pixel at x,y. The color is given as a single
|
|
numerical value for single band images, and a tuple for
|
|
multi-band images
|
|
|
|
:param xy: The pixel coordinate, given as (x, y).
|
|
:param color: The pixel value according to its mode. e.g. tuple (r, g, b) for RGB mode)
|
|
|
|
.. method:: __getitem__(self, xy):
|
|
|
|
Returns the pixel at x,y. The pixel is returned as a single
|
|
value for single band images or a tuple for multiple band
|
|
images
|
|
|
|
:param xy: The pixel coordinate, given as (x, y).
|
|
:returns: a pixel value for single band images, a tuple of
|
|
pixel values for multiband images.
|
|
|
|
.. method:: putpixel(self, xy, color):
|
|
|
|
Modifies the pixel at x,y. The color is given as a single
|
|
numerical value for single band images, and a tuple for
|
|
multi-band images. In addition to this, RGB and RGBA tuples
|
|
are accepted for P images.
|
|
|
|
:param xy: The pixel coordinate, given as (x, y).
|
|
:param color: The pixel value according to its mode. e.g. tuple (r, g, b) for RGB mode)
|
|
|
|
.. method:: getpixel(self, xy):
|
|
|
|
Returns the pixel at x,y. The pixel is returned as a single
|
|
value for single band images or a tuple for multiple band
|
|
images
|
|
|
|
:param xy: The pixel coordinate, given as (x, y).
|
|
:returns: a pixel value for single band images, a tuple of
|
|
pixel values for multiband images.
|