William Robb wrote:
> ----- Original Message ----- 
> From: "Toine" 
> Subject: Re: Werid artifacts
> 
> 
>> It's underexposed. The colors of the sky are in the left part of the
>> histogram. If you adjust exposure in the raw converter it makes things
>> even worse. The left part of the histogram has less data and a smooth
>> gradient like this sky makes this visible
>>
> 
> Here's the unadjusted camera raw histogram.
> http://users.accesscomm.ca/wrobb/temp/weirdscreen.jpg

Yep. In the context of this particular image (which is an unusual case), 
that's underexposed. You want the data pushed all the way to the right - 
even a slight amount of clipping would probably be OK.

> I like John and Marks explanation.

In a way, it's the reverse of the old maxim of B&W printing: With 
digital you expose for the highlights, print for the shadows.



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