What John and Mark said and a little underexposure combined with a
gradient and posterization shows its ugly face.
http://en.wikipedia.org/wiki/Posterization


On Thu, Jun 5, 2008 at 2:38 PM, William Robb <[EMAIL PROTECTED]> 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
>
> I like John and Marks explanation.
>
> thanks gang
>
> William Robb
>
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