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Do it with the GIMP
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Overview of Features
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8 bits per colour value
2.2. 8 bits per colour value
The GIMP supports 8-bits per RGB colour value and 8-bit grayscale images.
That means pixel values in the range 0 to 255.
Demo:
Open lena_color.jpg.
Select the "Color Picker" tool from the toolbox.
Click on pixels of the image (or drag while holding the mouse button) and see the colour values that exist there.
There's a patch available at
film.gimp.org
that adds 16-bit precision to the GIMP.
It will be integrated into the main source tree in GIMP 2.0.
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Written by
Shlomi Fish