Centering · corners · edges

Grade it before you grade it.

Point your camera at a card. CENTERED finds it, flattens it and measures every border to a tenth of a millimetre, right in your browser.

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Readout

L / R ––/–– L –.–– · R –.–– mm

T / B ––/–– T –.–– · B –.–– mm

Worst side vs PSA limitsFront

Corner whitening

TL ––TR –– BL ––BR ––

Edge whitening

T ––R –– B ––L ––

SurfaceCan't be judged from one photo. Check it under a raking light.

CENTERED's estimate Centering –– · Corners –– · Edges ––

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How it measures

Same pipeline on every frame. No uploads, no servers, no guesswork you can't drag and check.

Step 1
Corners found

Colour edges vote for straight lines. The four that frame one flat border colour win, then each side snaps to sub-pixel.
Step 2
Flattened

A homography maps those corners onto a true 63 × 88 mm card at 10 px per mm, so tilt and perspective drop out.
Step 3
Border lines → ratios

Each side is scanned inward; the first edge that runs its whole length is the print border. Widths become L/R and T/B.

PSA's published centering limits, larger side shown. CENTERED caps its estimate with these and takes the worse of L/R and T/B.

Grade	Front	Back

Source: PSA Grading Standards. PSA lists most limits as approximate and may allow small variances for eye appeal.

Corner and edge whitening use CENTERED's own scale: the share of the outer 0.2–0.9 mm ring that has drifted from the border colour towards white.

The token behind the bench. On pump.fun, Solana.

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