Contrast Test

Same mark displayed on different background colors to test boundary detection.

What This Tests

Scanner's ability to detect the mark boundary (Outer Quiet Zone) on various background colors. The mark itself is identical in all cases—only the surrounding background changes.

Mark on white White (#FFFFFF)
Mark on gray Light Gray (#F0F0F0)
Mark on cream Cream (#F5F5DC)
Mark on light blue Light Blue (#E0F2FE)

All marks encode: https://gf-code.com/test/contrast

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