01
Set up a dark SDR reference
Use a dim room, a familiar SDR picture mode, and a centered viewing position. Avoid reflections and allow your eyes to adjust before inspecting the darkest patches.
ToolsFree browser-based screen test
Near-Black Grayscale Test for OLED Shadow Detail
Inspect RGB 0–16, 0–32, and 0–64 patches against black to check crushed shadows and distinguish faint near-black gray levels.
Panel testsTest workspace
Use every mode and inspect the entire panel, including corners and edges.
Test pattern
Fullscreen controls hide automatically. Move the pointer or tap to bring them back; Escape exits.
Signal range
Percentages describe the 0–255 RGB signal, not screen brightness or measured light output. These SDR patterns depend on browser color management and display settings.
F toggles fullscreen. Arrow keys switch modes. Escape exits.
How to use this test
How to test OLED black crush and shadow detail
02
Compare near-black RGB patches
Start with RGB 0–32 and 17 levels. Turn labels on to identify code values, then hide them so bright text does not interfere with judging faint patches.
03
Check range settings before adjusting black level
If many patches merge into black, verify the device’s input-range setting and repeat with RGB 0–64. Change one setting at a time and confirm with ordinary dark scenes.
What the result can tell you
Interpreting black crush in a near-black OLED test
Higher code values should generally look progressively lighter. Several merged patches may indicate lost shadow detail, but the lowest visible value also depends on room light, panel behavior, gamma, and your eyesight. No universal first-visible patch defines a pass.
Testing notes
These browser patches use full-range RGB 0–255. Avoid assuming they are video-range 16–235 reference levels.
Labels are hidden by default because they can make nearby dark patches harder to judge.
A phone camera can lift blacks or add noise; it cannot reliably measure the first visible gray level.
Near-black shadow detail test questions
Should RGB 1 always be visible on an OLED screen?
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No. Very low values may be difficult to see under normal viewing conditions. Look for a sensible progression and verify details in real content rather than requiring every patch to be visible.
Can this tool set the correct black level automatically?
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No. It displays reference patches but cannot read emitted light or change TV settings. Check your device’s range and picture controls manually.