HOW IT WORKS
Guide
How to capture an image that passes the checks, and what each of the nine quality signals actually measures.
The four steps
Where you are in the screening flow.
What each check measures
Expand a check to see what causes a failure and how to fix it.
Measures edge clarity across the document. A blurry photo usually means the camera moved while the shutter was open.
Rest your phone or scanner on a surface, or hold steady.
Looks for grain and speckling, which usually come from a dim scene where the camera boosts its gain.
Add more light rather than brightening the image afterwards.
Compares overall brightness and contrast. Very dark or washed-out images fail here first.
Avoid direct flash and shoot in even, indirect light.
Measures how evenly the page is lit. A bright corner with a dark opposite corner is a common cause of rejection.
Use a single light source away from the page.
Detects reflections and hotspots on the surface of the document.
Tilt the document slightly and move away from direct light.
Estimates print resolution. Small images scaled up look soft even when the focus is fine.
Capture at the highest quality the device offers.
Checks whether the document edges look rectangular. Phone photos taken at an angle often skew.
Hold the camera parallel to the page.
Measures how much of the frame the document fills. A small document in a large frame loses detail.
Move closer until the page fills most of the frame.
Checks that no part of the document is cut off by the edge of the image.
Leave a small margin around every edge.