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This library is built in the open.
If you spot an error, have a suggestion, or just want to say hello — we’d love to hear from you.

A standard digital imaging calibration target. The top section consists of a grid of colored squares, known as a color checker. The bottom section is a resolution test chart containing various line patterns, numerical scales, and circular radial patterns, with the text "BSB Bayerische StaatsBibliothek © 2007 digitalfoto-trainer.de".