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Auto-Level Versus Auto-Contrast

Posted: Mon Feb 04, 2019 9:36 am
by mgilbert
What is the difference between the Auto-Level and Auto-Contrast commands??? What does each actually do?

Re: Auto-Level Versus Auto-Contrast

Posted: Mon Feb 04, 2019 11:46 am
by xnview
'Auto levels' try to expand the histogram of intensity
'Auto contrast' apply brightness/contrast following histogram

Re: Auto-Level Versus Auto-Contrast

Posted: Mon Feb 04, 2019 12:41 pm
by mgilbert
xnview wrote:
Mon Feb 04, 2019 11:46 am
'Auto levels' try to expand the histogram of intensity
'Auto contrast' apply brightness/contrast following histogram
I understand how auto-contrast works - it finds the brightest and darkest points in a photo, and sets them to a brightness of 0% and 100%

I'm sorry, but I still don't understand what auto-level does. I've never heard of an "intensity' adjustment. Could you explain further?

Thanks...