Roughly how wide is the scene and how far away would you be looking at it? This lets us show results in cycles per degree — the same units used in contrast sensitivity testing. Ballpark numbers are fine.
Stop Sign
6 ft wide · 50 ft away
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Your own photo
Drop or click to upload
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scan line
↕ drag the green line to scan any row
Brightness Along the Line
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On Your Retina
Image inverted by the lens — analysis happens here
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Spatial Frequency Spectrum
Colored bars are visible to you · dim red bars are beyond your contrast sensitivity