8 Mistakes That Ruin a Card Scan (and How to Get It Right First Time)

Most bad card scans come from eight mistakes: glare, a tilted phone, a busy background, a sleeve, coloured light, a loose crop, tilting a holo to kill glare, and a border that blends into the background.

A pre-grade is only as good as the photos behind it. Every one of these mistakes can hide a real defect or create a fake one. Here is how to avoid each.

1. Glare on the card

Glare is a bright, mirror-like reflection that follows the light and moves when the card tilts. Gradeon is trained to ignore it, but glare can hide the defect underneath, and it is the number-one cause of a wrong read on a phone photo. Use soft, diffused light, such as daylight from a window or a lamp bounced off a wall, and never direct flash.

2. Shooting at an angle

A card photographed at an angle looks like a trapezoid, and the borders on one side look thinner than they are. That distorts centering. Hold your phone flat and parallel to the card, or rest it on a stable surface.

3. A busy or light background

Gradeon finds the physical edge of the card to measure the borders. Patterns, textures and light surfaces make that edge harder to find. Use a dark or black, matte background so the edge stands out cleanly.

4. Scanning through a sleeve

Sleeves and top loaders add reflections, scratches of their own and a second edge that confuses the measurement. Take the card out of its sleeve for the scan, handle it by the edges, and put it back straight after.

5. Coloured light

Warm household bulbs or coloured lamps shift the colour of the whole card and make it harder to tell real whitening, which shows tan or cream fibres, from a colour cast. Use neutral white light.

6. A loose crop

If the card is small in the frame, fine defects on corners and edges are only a few pixels wide. Fill about 70–80% of the frame with the card, with all four corners visible and a little background around them.

7. Tilting a holo to get rid of glare

It is tempting to tilt a foil card until the reflection disappears, but that brings back mistake number 2. Keep the card flat and parallel to your phone, and move the light instead until the glare is gone.

8. A dark border on a dark background

A dark background works for most cards, but a card with a very dark border can blend into it, and the edge becomes hard to find. If the border and the background are similar, check that the pins sit on the real corners during the centering check, and drag them into place if they don't. The grade is not final until you confirm both sides.

Add detail shots for the close calls

Detail shots are close-ups of a corner, an edge or a patch of surface. Free scans allow 2 and Pro scans allow 8. They are worth adding even on a card that looks clean, because micro-defects that are invisible in a full-card photo show up in a macro.

For the full setup, from preparing the card to saving it, read How to Take the Perfect Picture for Accurate Pre-Grading.

Scan your first card the right way

Set up once, then run a Full Grade: Gradeon guides the capture of the front, the back and your detail shots.

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