PE2019: erroneous thresholding values

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  • Updated 1 year ago
  • (Edited)

Upgraded to Photoshop Elements (PE) 2019 from PE5.  The thresholding results by both the filter and layer method produce erroneous results that do not match as outlined under the "apply the threshold filter" (https://helpx.adobe.com/photoshop-elements/using/adjustment-filters.html#main-pars_heading_4).  The PE2019 results do not match my externally verified images (which have a known value with a TH=128).  The PE2019 results also do not match PE5.  However, my externally verified images do match PE5. 

Was there an algorithm change?  Also, why do the different methods produce different results?
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John Pham

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  • frustrated

Posted 1 year ago

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JEA

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So your saying, for example, that in pse 2019 when using Threshold set to 128 that pixels from 129 to 255 are not white and pixels from 127 to 0 are not black?

Does pse 5 seem to be right?

Are you able to post one the "verified" images so others can check their own installs?

Or screenshots showing how the threshold in pse 2019 is wrong?

What version of windows are you running pse 5 and pse 2019 on?
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John Pham

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Essentially yes, there appears to be an issue with how PSE2019 thresholds pixels, as some pixels are not being captured at various threshold levels.  I've observed this because of my externally verified (through Matlab) standard images, which measure more or less 95% +/- 0.01%.

PSE5 produces correct results.  For image below 94.99%. 

This same image in PSE2019 yields 99.27% (filter method) and 95.59% (adjustment layer method).  These results can vary widely however, and seem to change indiscriminately.

PSE5 was run on Windows 7, and PSE2019 on Windows 10.