Test patterns at
your exact raster

What each one is for

• Panel map — every tile numbered by row and column, with its own pixel origin printed inside it and a corner marker that is different in each corner. A swapped tile shows the wrong number, a rotated one shows the marker in the wrong corner, and a dead receiver card shows nothing. This is the pattern that turns "something is wrong up there" into "row 3, column 7".
• Moiré 1:1 — a one-pixel checkerboard, plus one-pixel horizontal and vertical lines. On a wall being shot by a camera this is where moiré and scan artefacts appear, and it only means anything if the image is mapped one pixel per LED. If it looks soft, something in the chain is scaling.
• Dark detail — steps from black to 12%, which is where LED walls actually struggle: crushed blacks, a grey floor that is not black, and tiles that disagree with each other in the dark long before they disagree in the light.
• Uniformity — flat fields at 25%, 50%, 75% and 100%, and full red, green and blue. Flat colour is unforgiving: a panel with a different batch of LEDs shows up immediately, and so does a dead pixel.
• Banding ramps — horizontal ramps per channel and in grey, for finding the bit depth you are really getting after processing.
• Safe areas — centre cross, thirds, and 90% / 80% boxes, so content can be framed against the wall's real aspect rather than a guess.

Putting a camera on it?

Shooting an LED wall: why it moirés, what fixes it, the difference between moiré and scan banding, and an on-site order of checks that starts with the panel map above.

Do not know the numbers yet?

The LED wall calculator turns panel count and pitch into the resolution, the size in metres, the distance where the pixels stop being visible, and the smallest text the back row can read — then bring the raster back here for the patterns.

Why the size matters

An LED wall is not a screen with a resolution someone chose — it is however many tiles are on the truck. Send it a 1920×1080 chart and a processor scales it, which destroys precisely the thing a one-pixel pattern is testing. Generated at the wall's own size, a pixel in the file is a pixel on the wall.

Everything here is drawn in your browser and saved straight to your machine. Nothing is uploaded, there is no sign-up, and the patterns are yours to use on any job.

Playing them on the wall

Any player will show a PNG. Deckboy is a free, open-source cue deck that will hold them as cues beside the show, send them out over NDI, SRT, Blackmagic SDI or SMPTE ST 2110, and generate its own moving diagnostics — a frame counter, a latency clock and a motion test card — for the faults a still cannot show. It also has a ready-made kit at 1920×1080 and a browser screen check for the screen in front of you.