PixelAccess Class

The PixelAccess class provides read and write access to 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.

Example

The following script loads an image, accesses one pixel from it, then changes it.

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.

px[-1,-1] = (0,0,0)
print (px[-1,-1])

PixelAccess Class

class PixelAccess
__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

Parameters
  • xy – The pixel coordinate, given as (x, y).

  • color – The pixel value according to its mode. e.g. tuple (r, g, b) for RGB mode)

__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.

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.

Parameters
  • xy – The pixel coordinate, given as (x, y).

  • color – The pixel value according to its mode. e.g. tuple (r, g, b) for RGB mode)

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.