PixelAccess Class

The PixelAccess class provides read and write access to PIL.Image data at a pixel level.

注解

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
im = Image.open('hopper.jpg')
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

参数

• 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.

参数

• 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.