This is a 10 section step wedge to allow you to check that you have a full chromatic scale
available on your monitor. You should be able and see the 10 separate tones going from an all white to a total black.
Stand back, defocus your eyes (so that the screen appears blurry).
Use the slider to match the gray on the right with the gray on the left.
When they look the same, read out the value at the bottom. This is your gamma.
Note: If you do not see a split gray box with a slider on the right you must set your browser
JAVA permission to Medium.
©Adobe
Adobe color test image.
Just something fun to bugger your eyeballs. Try and find the black dot.