ImageChops (“Channel Operations”) Module

The ImageChops module contains a number of arithmetical image operations, called channel operations (“chops”). These can be used for various purposes, including special effects, image compositions, algorithmic painting, and more.

For more pre-made operations, see ImageOps.

At this time, most channel operations are only implemented for 8-bit images (e.g. “L” and “RGB”).

Functions

Most channel operations take one or two image arguments and returns a new image. Unless otherwise noted, the result of a channel operation is always clipped to the range 0 to MAX (which is 255 for all modes supported by the operations in this module).

PIL.ImageChops.add(image1, image2, scale=1.0, offset=0)

Adds two images, dividing the result by scale and adding the offset. If omitted, scale defaults to 1.0, and offset to 0.0.

out = ((image1 + image2) / scale + offset)

返回类型:Image

PIL.ImageChops.add_modulo(image1, image2)

Add two images, without clipping the result.

out = ((image1 + image2) % MAX)

返回类型:Image

PIL.ImageChops.blend(image1, image2, alpha)

Blend images using constant transparency weight. Alias for PIL.Image.Image.blend().

返回类型:Image

PIL.ImageChops.composite(image1, image2, mask)

Create composite using transparency mask. Alias for PIL.Image.Image.composite().

返回类型:Image

PIL.ImageChops.constant(image, value)

Fill a channel with a given grey level.

返回类型:Image

PIL.ImageChops.darker(image1, image2)

Compares the two images, pixel by pixel, and returns a new image containing the darker values.

out = min(image1, image2)

返回类型:Image

PIL.ImageChops.difference(image1, image2)

Returns the absolute value of the pixel-by-pixel difference between the two images.

out = abs(image1 - image2)

返回类型:Image

PIL.ImageChops.duplicate(image)

Copy a channel. Alias for PIL.Image.Image.copy().

返回类型:Image

PIL.ImageChops.invert(image)

Invert an image (channel).

out = MAX - image

返回类型:Image

PIL.ImageChops.lighter(image1, image2)

Compares the two images, pixel by pixel, and returns a new image containing the lighter values.

out = max(image1, image2)

返回类型:Image

PIL.ImageChops.logical_and(image1, image2)

Logical AND between two images.

out = ((image1 and image2) % MAX)

返回类型:Image

PIL.ImageChops.logical_or(image1, image2)

Logical OR between two images.

out = ((image1 or image2) % MAX)

返回类型:Image

PIL.ImageChops.multiply(image1, image2)

Superimposes two images on top of each other.

If you multiply an image with a solid black image, the result is black. If you multiply with a solid white image, the image is unaffected.

out = image1 * image2 / MAX

返回类型:Image

PIL.ImageChops.offset(image, xoffset, yoffset=None)

Returns a copy of the image where data has been offset by the given distances. Data wraps around the edges. If yoffset is omitted, it is assumed to be equal to xoffset.

参数:

• xoffset – The horizontal distance.
• yoffset – The vertical distance. If omitted, both distances are set to the same value.

返回类型:

Image

PIL.ImageChops.screen(image1, image2)

Superimposes two inverted images on top of each other.

out = MAX - ((MAX - image1) * (MAX - image2) / MAX)

返回类型:Image

PIL.ImageChops.subtract(image1, image2, scale=1.0, offset=0)

Subtracts two images, dividing the result by scale and adding the offset. If omitted, scale defaults to 1.0, and offset to 0.0.

out = ((image1 - image2) / scale + offset)

返回类型:Image

PIL.ImageChops.subtract_modulo(image1, image2)

Subtract two images, without clipping the result.

out = ((image1 - image2) % MAX)

返回类型:Image