Old 16-09-2020, 02:01 PM
Registered User

AdamJL is offline
Join Date: Sep 2010
Posts: 515
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.


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.


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).


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)


edit: I can't seem to embed images here, so attached them and provided direct links)
Attached Thumbnails
Click for full-size image (DSS.jpg)
74.0 KB41 views
Click for full-size image (FastStone.png)
16.0 KB37 views
Click for full-size image (Photoshop.png)
28.4 KB37 views
Reply With Quote


Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT +10. The time is now 10:25 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Limpet Controller
NexDome Observatories
Astronomy and Electronics Centre