Display settings

Clock and phase


Gamma calibration

Black level

White saturation

Gradient (banding)

Inversion (pixel-walk)

Response time

Viewing angle

Contrast ratio

Subpixel layout



This test may be affected by your operating system color profile.

The following image shows scales of linearly increasing RGB values. On a good monitor, you should see roughly equal steps in brightness over the full range from 1 to 32, and in all colors. Bar 1 should be visible. A bad monitor will not show the leftmost few rectangles, will not show a difference between the rightmost few, or shows a relatively large jump between numbers 31 and 32.

Quick gamma
  test image

Adjust the contrast (and maybe brightness) setting of the monitor to improve the display of this image. If you want to change the color temperature settings, do it now, rather than after all the tests. Normally, you'll want a 6500 K color temperature: not too yellow and not too blue.

Because video-card settings can also affect the brightness steps, it is best to use this to compare screens that are hooked up to the same computer.



What it should look like

Contrast test, reference image
Reference image for the contrast test.

Above is shown what the quick gamma test should look like: all bands are distinguishable, from the very darkest ones to the brightest ones.

What it should not look like

Contrast example (too bright) Contrast example (too dark)
Contrast setting to high (top/left) or too low (bottom/right).

Some monitors saturate the bright colors: you can't see the difference between the rightmost few bands (left image). Increasing the contrast setting may help. With other monitors, the darkest few shades disappear. Again, changing the contrast setting might help.


© Copyright Han-Kwang Nienhuys, 2008. The text and accompanying images may not be redistributed. This includes placing the images on other websites, either as a copy or through hotlinking. Read more...

Last modified 27 Mar 2008