The Amazing Gamma Measuring Applet
Have you ever noticed that when you view the same image (say a
picture off the net) on two different monitors the image can appear
very differently? Well, that's because different monitors have
different gamma values (especially, if they are of different brands).
This is OK though, because if you are using xv or some other good
viewing program, you can "gamma-correct" the image. The question is,
what do you set it to? In other words, what is the gamma of your
monitor? This little Java applet will try to help you figure out the gamma
of your monitor.
Stand back, defocus your eyes (so that the screen appears blurry) and
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
For more information about gamma and gamma correction, you can look at
Gamma Correction Home Page
which has a lot of useful stuff.
Greg Ward has a very nice
Gamma Chart that uses the same idea as my applet but has no "moving
Another good resource is
Gamma Information Page. Actually, Pete was the one who
gave me the idea for this applet (inspired by Ricardo Motta).
NOTE: This applet sucks on 8-bit monitors since Java can't grab all
255 gray-levels it needs from the color table thus you may see some
blues and/or yellows in there. If you know how to correct this
problem, please drop me a note.
This applet is written by Alyosha Efros, back in his care-free undergrad
University of Utah days.