display values when auto correcting

Ideas for improvements and requests for new features in XnView Classic

Moderators: XnTriq, helmut, xnview

BabaG
Posts: 150
Joined: Sat Mar 03, 2007 6:41 am

display values when auto correcting

Post by BabaG »

i noticed this in playing with auto-levels but i think it would
be useful for anything that has an 'auto' button.

when applying an auto correction, like auto-levels, it would be
very helpful to display the values that xnview is applying
to the image. that way, if it's something we like, we could use
those values in a batch process or in nconvert.

it would make xnview a helpful tool for deriving settings to be
used with either further xnview processing, or processing in
nconvert.

thanks,
BabaG
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Troken
Posts: 698
Joined: Thu Feb 09, 2006 10:18 am
Location: Sweden

Post by Troken »

Are not the values of auto-levels and auto-contrast individual for each and every image? If so, the values of one image will not be good for the next - the next image will need its own auto-correction in order to give the best result.

If the images are very similar it might work?
User avatar
XnTriq
Moderator & Librarian
Posts: 6138
Joined: Sun Sep 25, 2005 3:00 am
Location: Ref Desk

Post by XnTriq »

xnview ([url=http://newsgroup.xnview.com/viewtopic.php?p=36546#36546]Image correction[/url]) wrote:
geometra wrote:Hi Pierre:
Can you explain how do you apply auto levels transformation?

I know how Photoshop does it because it is explained at its help. They cut the histogram at the tails by 0.5% of the values previous to the expansion. Are you making any of this? It is important to me to know if I will loos some values if I apply auto-levels and how many.

Congratulations for your work!
Yes i cut histogram too
BabaG
Posts: 150
Joined: Sat Mar 03, 2007 6:41 am

Post by BabaG »

one of the things i do is to shoot timelapse images. for this type of work
i want to apply a single setting to all of the images in a sequence.

i pick a representative frame and derive settings from it. often times
the auto settings look very good and i'd like to apply them but don't
know what they are.

thanks,
BabaG