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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 fork of the GIMP called CinePaint
that adds 16-bit and 32-bit color-value precision to.
The core GIMP version will provide such functionality in the future, once GEGL is integrated.
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Written by
Shlomi Fish