Image correction

thire · Post by **thire** » Sat Oct 01, 2005 9:17 pm

It would be cool to have an option to do some auto-correction of images (brightness, contrast, gamma, ...). Are there some algorithms to estimate "good" values?

Post by **xnview** » Sun Oct 02, 2005 12:42 pm

thire wrote:It would be cool to have an option to do some auto-correction of images (brightness, contrast, gamma, ...). Are there some algorithms to estimate "good" values?

You have auto levels and auto contrast

thire · Post by **thire** » Sun Oct 02, 2005 12:50 pm

oh, yes, I see. In the menu. Sorry.
If there was an "auto"-button in the adjust->brightness... dialog it could be helpful.
sorry for my noise.

th

geometra · Post by **geometra** » Sat Aug 19, 2006 6:02 am

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!

Post by **xnview** » Sat Oct 07, 2006 7:56 am

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

XnView Software

Image correction

Image correction

Re: image corretion

how

Re: how