The ImageEnhance Module
The ImageEnhance module contains a number of classes that can be used for image enhancement.
Example
import ImageEnhance
enhancer = ImageEnhance.Sharpness(image)
for i in range(8):
factor = i / 4.0
enhancer.enhance(factor).show("Sharpness %f" % factor)
Also see the enhancer.py demo program in the Scripts directory.
Interface
All enhancement classes implement a common interface, containing a single method:
enhancer.enhance(factor) => image
Returns an enhanced image. The factor is a floating point value controlling the enhancement. Factor 1.0 always returns a copy of the original image, lower factors mean less color (brightness, contrast, etc), and higher values more. There are no restrictions on this value.
The Color Class
The color enhancement class is used to adjust the color balance of an image, in a manner similar to the controls on a color TV set. This class implements the enhancement interface as described above.
ImageEnhance.Color(image) => Color enhancer instance
Creates an enhancement object for adjusting color in an image. A factor of 0.0 gives a black and white image, a factor of 1.0 gives the original image.
The Brightness Class
The brightness enhancement class is used to control the brightness of an image.
ImageEnhance.Brightness(image) => Brightness enhancer instance
Creates an enhancement object for adjusting brightness in an image. A factor of 0.0 gives a black image, factor 1.0 gives the original image.
The Contrast Class
The contrast enhancement class is used to control the contrast of an image, similar to the contrast control on a TV set.
ImageEnhance.Contrast(image) => Contrast enhancer instance
Creates an enhancement object for adjusting contrast in an image. A factor of 0.0 gives an solid grey image, factor 1.0 gives the original image.
The Sharpness Class
The sharpness enhancement class is used to control the sharpness of an image.
ImageEnhance.Sharpness(image) => Sharpness enhancer instance
Creates an enhancement object for adjusting the sharpness of an image. The factor 0.0 gives a blurred image, 1.0 gives the original image, and a factor of 2.0 gives a sharpened image.