Gradient banding on several screens: compare the steps side by side

Join each screen to one session. Any device in the session can switch the mode, and the others follow. Open the page link, which starts the tool in gradient mode with black at one corner and white at the opposite corner. Put each screen in full screen mode, then look across the whole ramp for visible stripes. Compare the screens one after another while the same ramp is showing. Then try a different pair of stops. Set the two stops to colors that are close in brightness, such as two dark grays, using the stop controls. That's a thing to try, not a sure result, so compare every screen with the same pair.

Look along the ramp from the black end to the white end. Stripes, a sudden jump in shade, or a band that appears on one screen but not the next are the things to note. Write down which screen shows them and roughly where on the ramp they sit. Watch the whole screen, not one corner, since the ramp runs diagonally from corner to corner. The gradient banding test covers the places steps can start, from software to the panel, so read it next.

The tool can't say whether banding comes from the screen, the cable, its settings or the image source. It doesn't show how many bits a screen uses, and it doesn't measure the steps. Your own eyes and the room light change how visible a step is, so check each screen in the same light and from the same spot. If you need numbers, a hardware colorimeter (also called a calibrator or spectrophotometer) and its software can measure and calibrate a screen.