Re: ImageJ "mean" vs Photoshop "mean"?

Posted by Herbie on Nov 29, 2020; 12:24pm
URL: http://imagej.273.s1.nabble.com/ImageJ-mean-vs-Photoshop-mean-tp5024242p5024247.html

Greetings David,

be careful with Photoshop. It was/is not designed for scientific image
processing and if you don't carefully control all options, you will end
up with results as the reported one. One reason for the different
results may be due to gamma-correction in photoshop but there are many
other possible reasons.

For scientific image processing and analyses always use a dedicated
software, e.g. ImageJ.

Regards

Herbie

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Am 28.11.20 um 19:26 schrieb David Palermo:
> I am using my scanner as a densitometer and I am measuring gray patches from a step-wedge in both Photoshop and ImageJ. The mean values are different between each program. Why is that? ImageJ's mean is 41726 and Photoshop's mean of the same patch from the same file is 20861.
>
> Thank you!
>
> David
>
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> ImageJ mailing list: http://imagej.nih.gov/ij/list.html
>

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