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Based on the PNGsuite.
(text copied from the official PNGsuite homepage)
To test if your viewer handles gamma-correction, (3x) 6 test-files are available.
They contain corrected color-ramps and a corresponding gamma-chunk with the file-gamma value.
These are created in such a way that when the viewer does the gamma correction right, all 6 should be displayed identical.
If they are different, probably the gamma correction is omitted.
In that case, have a look at the two right columns in the 6 pictures.
The image where those two look the same (when looked from far) reflects the gamma of your system.
However, because of the limited size of the image, you should do more elaborate tests to determine your display gamma.
There are two blocks of images. The leftmost block of 3x6 images is the reference snapshot.
The rightmost block should look identical.
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The following images were used (left to right):
(first row)
g25n0g16 - grayscale, file-gamma = 2.50
g10n0g16 - grayscale, file-gamma = 1.00
g07n0g16 - grayscale, file-gamma = 0.70
g05n0g16 - grayscale, file-gamma = 0.55
g04n0g16 - grayscale, file-gamma = 0.45
g03n0g16 - grayscale, file-gamma = 0.35
(second row)
g25n2c08 - color, file-gamma = 2.50
g10n2c08 - color, file-gamma = 1.00
g07n2c08 - color, file-gamma = 0.70
g05n2c08 - color, file-gamma = 0.55
g04n2c08 - color, file-gamma = 0.45
g03n2c08 - color, file-gamma = 0.35
(third row)
g25n3p04 - paletted, file-gamma = 2.50
g10n3p04 - paletted, file-gamma = 1.00
g07n3p04 - paletted, file-gamma = 0.70
g05n3p04 - paletted, file-gamma = 0.55
g04n3p04 - paletted, file-gamma = 0.45
g03n3p04 - paletted, file-gamma = 0.35
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