But his charts are useful for conducting informal tests. They provide a comparison strip at low frequency for the 10% or 50% MTF contrast, adjacent to the 100% MTF test strip (density controlled by sine wave) which increases in frequency. It's far less than perfect--the black is only as black as a printer can print it, for example--but nothing's better for home testing. It's a great leap ahead of the Air Force Test Chart.
It also taught me that 10% MTF, which is how most people interpret their AF test-chart images, isn't really indicative of what will be seen as crisp sharpness.
Rick "who does testing for fun, but evaluates prints on their own merits" Denney
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