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Old 16-09-2020, 01:01 PM
AdamJL
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Join Date: Sep 2010
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Understanding Histograms

Hi all

Trying to understand the editing process of astrophotography. I took some 30 second subs last night for only about 50mins to produce a nice washed out shot in DSS

When I see the histogram in DSS, it looks as follows (DSS)
The histogram looks fairly centred, albeit I don't have values on the X axis to verify.

https://www.iceinspace.com.au/forum/...2&d=1600228545

So when I view the TIF file in FastStone Image Viewer, I get a histogram with values that looks as follows. Most of the data in the image sits between 64 and 128.

https://www.iceinspace.com.au/forum/...3&d=1600228545

But then I load it into Photoshop, open up Curves and suddenly the data is now below 64 (you can run your mouse over the Y lines to get the values.. the first line is indeed 64).

https://www.iceinspace.com.au/forum/...4&d=1600228545

Can anyone explain why Photoshop loads a histogram differently to the other two programs?

(ignore the difference in file name in DSS, it's the same image, I just had to copy it to open it again in PS as I was already editing it)

Cheers
Adam

edit: I can't seem to embed images here, so attached them and provided direct links)
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Click for full-size image (FastStone.png)
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Click for full-size image (Photoshop.png)
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