Inspect grayscale steps, shadow separation, color block differentiation, and text clarity on contrasting backgrounds.
Look closely at the darkest and brightest patches. You should be able to distinguish near-black from black and near-white from white.
Standard web browsers render RGB pixel patterns directly to your operating system pipeline. Browsers cannot physically measure native contrast ratios (e.g. 1000:1 or 1,000,000:1) without external hardware photometer sensors. This test provides calibrated visual steps to evaluate shadow detail, white clipping, and gradation smoothness.
Checks whether near-black shadow tones and near-white highlight steps remain distinguishable from pure black and pure white without washing out or clipping.
View the display perpendicular to your eyes at normal distance. In the Black Level test, check if steps 2 and 3 are visible. In White Level, check if steps 253 and 254 remain distinct.
Crushed blacks: Dark patches merge into black (raise brightness or adjust gamma). Clipped whites: Bright patches blend into white (lower monitor contrast).
Screen Tester cannot measure native physical contrast ratio (e.g. 1000:1) through the browser. This test provides calibrated patterns to evaluate visual contrast, shadow clipping, and color separation.
Tune your black levels and white point to ensure no detail is lost in the extreme ranges.
Tune your monitor's contrast to ensure bright details aren't clipped.
Tune your monitor's black levels to ensure dark details aren't crushed.
Visually estimate your monitor's gamma tracking (target 2.2 for sRGB).
