April 2020
Intermediate to advanced
438 pages
12h 2m
English
Content preview from Python Image Processing Cookbook
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Changing the brightness of the image by varying the luminosity channel
Perform the following steps to change the brightness of a colored image using the Lab color space and scikit-image library functions:
- Convert the input image from RGB into the Lab color space and increase the first channel values (by 50):
im1 = rgb2lab(im)im1[...,0] = im1[...,0] + 50
- Convert it back into the RGB color space and obtain a brighter image:
im1 = lab2rgb(im1)
- Convert the RGB image into the Lab color space and decrease only the first channel values (by 50, as seen in the following code) and then convert back into the RGB color space to get a darker image instead:
im1 = rgb2lab(im)im1[...,0] = im1[...,0] - 50 im1 = lab2rgb(im1)
If you run the preceding ...
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