CardJeng

centering analyzer

Upload a near-top-down photo of a trading card. Drag the outer handles to the physical card edge and the inner handles to the artwork-start boundary (where the colored border meets the central art — not the outer edge of the colored band). Use the Colors toggle if the handles blend with a filter. Pinch / wheel = zoom. Drag empty area = pan. Arrow keys nudge selected handle 1 px (Shift = 10 px). Pinch to zoom. Drag empty area to pan.

正面 · Front

centering analyzer

Upload 100% outer inner

Upload a photo to begin.

Tap handle to select. Pinch to zoom. Drag empty area to pan. Use ⟳ to rotate.

Left / Right

— / —

— / — mm

Σ L+R: — mm est.

Top / Bottom

— / —

— / — mm

Σ T+B: — mm est.

Ratios (L/R, T/B) are the primary measurement. mm values are estimates — biased by handle placement, lens distortion, and rounded card corners.

Front centering estimate

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Centering-only estimate. Not a real grade. Real grades also include corners, edges, surface.

Schematic preview

Outer = card boundary after perspective correction. Inner = inner-frame markers warped into rectified space.

Handle placement guide

The colored frame has two visible edges. Place yellow at the inner one — where the central artwork actually starts — not the outer edge of the colored band.

PSA centering thresholds

Gem Mint 10: ≤ 55/45 front, ≤ 75/25 back
Mint 9: ≤ 60/40 front, ≤ 90/10 back
NM-MT 8: ≤ 65/35 front
NM 7: ≤ 70/30 front

Tips & caveats

Outer handles = physical card edge. Inner handles = where the central artwork begins (inner edge of the colored band).
If Σ L+R or Σ T+B looks far from your caliper-measured total, your handle placement (most likely inner) is biased — re-check.
Full-art / V / ex / SAR cards often lack a clear inner frame — centering becomes ambiguous.
Card is assumed flat. Bent cards give wrong mm offsets.
Card dimensions assumed 63 × 88 mm.
Best capture: dark matte background, no flash, even diffused light, phone parallel to card, full card with margin, sleeves removed. Lens choice matters: prefer 2× / telephoto if your phone has one. Ultra-wide adds barrel distortion that bends straight card edges and biases L/R borders ~0.1-0.2 mm.
Handles auto-lock after 1.5 s of no movement to prevent the tiny release-nudge. A countdown ring in the center of the canvas shows remaining hold time. Lift and tap again to resume; green ring = locked.

背面 · Back

filter inspection

Upload back 100%

Independent filter for spotting white spots / surface defects on the back. No handles or measurement here — pinch / wheel to zoom, drag empty area to pan. · 獨立 filter 用嚟檢查背面白點 / 表面瑕疵，呢度淨係睇相，無 handle。

⤴

㩒一下或拖入背面相

Tap or drop, or use Upload back above

Pinch to zoom · Drag empty area to pan.