This test is very difficult to accurately adjust in bright lighting. It is easier to calibrate in total darkness at night, or in a totally darkened room. If adjusting a mobile display (e.g. laptop), bring it to a dark room like an interior room.

1. The purpose of this test pattern is to help you adjust your display settings until you barely can see moving black squares on a dim-grey background. They're RGB(0,0,0) versus RGB(1,1,1) in the bit depth you choose.
2. Adjust your display's picture settings (Black Levels, Contrast, Brightness) until all three conditions meet:
   • Row #1: You can barely see blocks containing numbers simultaneously.
   • Row #2: You can barely see the moving black blocks on dim background.
   • Row #3: You can barely see the moving dim blocks on black background.
   • Row #4: You can barely see a gap between 2 stationary blocks (PLUGE) with a gap in between.

This test also has a white level mode, for calibrating your white level clipping. Calibrate both black levels and white levels, to maximize your brightness gamut in sRGB (SDR) mode. This test is currently designd for the Adobe sRGB subset of your colorspace.

You can click/tap the screen to see square boundaries briefly appear; these are simply guide lines to let you know where they are on the screen. The guide lines are there to assist you in locating difficult-to-find rectangles, and are not part of the calibration.