The images on this page can be used for rough calibration of your monitor.
It is important that people viewing your images (particularly the judges) see the same thing on their monitor that you do on yours.
Ideally you should be able to differentiate the 26 individual boxes (A to Z) in the grey scale above or the 33 individual bars in the grey scale below.
You should also just be able to detect three rings in each of the two "target" images above.
The darkest square "A" should be pure black ... not grey.
In the "target" images the rings A, B and C as well as X, Y and Z correspond to the similarly lettered boxes in the grey scale
You should adjust the brightness and contrast of your monitor so that as many as possible of the individual bars or boxes are visible.
If more than the first three dark boxes or bars appear the same then detail in the shadows of images may not be visible on your monitor.
If more than the first three light boxes or bars appear the same then detail in the highlights of images may not be visible on your monitor.