Hi, I would like to share the little software tool gammaPATT which I just developed for fun. It's free for everybody. It creates checkerboard like gamma patterns. You can check gamma calibration of your monitor at different Luminance stages. It also shows you how your monitor performs at different viewing angles.

Hope you will enjoy. Please let me know some good ideas for improvements.

Note: Square in the middle of color frame should appear invisible. Left square should be slightly darker and right square slightly brighter. For that purpose both L (Luminance) values should be equal. Click on lower L value (for inner Square) to adjust to the upper (for outer checkerboard) automatically.

MAC version will come soon;-)

https://www.dropbox.com/sh/flkgsa6872sknl2/AAA3BLm3BuBA3M09DB7Xoy_3a?dl=0