Bū tools
Test pattern
Test patterns for your screens.
What it does
Makes a test pattern at the exact size you need. A test pattern is a reference image whose every pixel is known: shown on a screen, a projector or sent through a video chain, it tells you at a glance if the picture arrives intact (colours, black level, framing, sharpness). If the pattern comes out cropped, stretched or washed out, something along the way is changing the image.
Also handy at the start of a timeline, on a waiting screen before a screening, or to check an export.
How
- Pick a resolution, or type a width and a height.
- Pick a pattern: Colour bars (colours and black level), Framing (grid, circle to check the proportions, action safe 93 % and title safe 90 %), Grayscale (steps from 0 to 100 %, grey and RGB ramps to spot banding), Focus (Siemens stars to check sharpness, in the centre and the corners).
- Solid colours inspects a screen (dead pixels, uneven light). In fullscreen, solid colours go one after the other: tap, click, arrows or space; after the last one, you leave.
- On the colour bars, Labels name each band in small. Turn them off for a strict pattern.
- Info block: Off removes the whole block (logo, texts, resolution) for a bare pattern.
- Keep the Bū logo, upload your own (best: a square PNG with transparency, 512 × 512) or remove it, and choose its background.
- Add a project, a date and more info if you want. The date is today's by default: pick another one in the calendar, or Remove it. Each field has a character limit so the text always fits in the block. Then Export PNG.
- Fullscreen shows the pattern alone on the whole screen, to check a screen or a projector. Press Esc, click or tap to leave. Pick This screen first for a pixel-exact pattern.
Your logo stays on this device. The reset button brings back the Bū logo and the default settings.
Free, no account, nothing is sent: it runs in your browser, even offline.
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