Black Level Test
Count visible patches 1-32 on black background. All visible = healthy. Missing low = crushed blacks.
Look for the gray patches on the black background. You should see all patches labeled 1 through 32. If patches at low numbers (1-5) are invisible, your monitor is crushing blacks - increase brightness or change the OSD black level setting.
How to use
- Use Fullscreen patch grid in a dim room for the clearest read.
- If low-number patches stay invisible, verify GPU output is full range (e.g. NVIDIA Control Panel > Display > Output dynamic range = Full; AMD Display > Pixel Format = RGB 4:4:4 Full).
FAQ
Why 32 patches?
The reference pattern uses thirty-two 1-step grays from RGB 1 through RGB 32 on pure black—matching common online black-level charts.
Introduction
Count visible patches 1-32 on black background. All visible = healthy. Missing low = crushed blacks.
Look for the gray patches on the black background. You should see all patches labeled 1 through 32. If patches at low numbers (1-5) are invisible, your monitor is crushing blacks - increase brightness or change the OSD black level setting.