[Image-SIG] Auto level with PIL?

Stefano Masini stefano at pragma2000.com
Wed Sep 7 22:10:14 CEST 2005

In this code all_same defaults to 0. The author says:
"I find the BEST way to color/density correct an image is to first set
the black/white point for each of the channels individually, so that
you use the entire available dynamic range."
While this is true, I must point out that you risk skewing the hue for
very dark colors and very bright ones. I think setting all_same to 1
would be a more color conservative option.


On 9/7/05, Fredrik Lundh <fredrik at pythonware.com> wrote:
> Chris Barker wrote:
> > I need to do something like Photoshop's Auto Level to a bunch of images.
> > Honestly, I have only a vague idea of what it does, but I saw that
> > someone posted a script to do it here about 6 years ago, but I can't
> > seem to get that code from the list archives.
> this one?
> http://aspn.activestate.com/ASPN/Mail/Message/image-sig/582729

More information about the Image-SIG mailing list