X-Y Addressability Indicator and Gradient - how to use this scale

MannyV

New member
Hi all,
Need some education here please.
The circular part seem fairly straight forward to read and understand. How do I read and test this step wedge scale portion horizontally and vertically for test? SPI - Samples per inch?
scale.png
 

SteveSuffRIT

Well-known member
Franz Sigg from RIT (retired, Switzerland) developed this test target.
I think after you output the file on a device, a moire pattern appears in the patch that matches the spi addressability.
 

Ulrich

Well-known member
SPI: Spots per Inch

following Steves moire pattern indicating: like this in the top half at 300 (but here it is just a screenshot..., we all know it from a film strip to identify the lpi of a print...):

1619676048399.png
 

MannyV

New member
Thank you, very practical device to measure vendors addressability when shopping around. Reading about vendors capabilities and proving it are always more reassuring when shopping. This can a good start also for identifying root causes.

I pulled this from one of his RIT papers
Addressability Indicator. Sometimes output devices indicate a higher addressability than they mechanically produce. This target helps to determine true mechanical addressability.
 

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