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What do automatic contrast and levels do?

Posted: Fri Feb 01, 2019 12:46 am
by lucmv
I use these two commands — automatic contrast and automatic levels — to improve photos. I usually like the results. Sometimes, not often, they seem to have no effect at all.

Would someone be so kind to explain what exactly those two commands do? No, their names are not self explanatory, at least not to me. I would love to get a deeper insight on what they do.

Anyone?

TIA

Re: What do automatic contrast and levels do?

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: What do automatic contrast and levels do?

Posted: Wed Feb 06, 2019 2:16 pm
by mobi
Where do I find this auto level/contrast option? :|

Re: What do automatic contrast and levels do?

Posted: Wed Feb 06, 2019 3:13 pm
by xnview
mobi wrote:
Wed Feb 06, 2019 2:16 pm
Where do I find this auto level/contrast option? :|
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