Actually I use masking and layer transparency.  But even if you're not 
using Photoshop whatever software you're using to combine the exposures 
is using layers of a sort.  It's just easier than doing it by hand.  I 
expect an expert using layers could do a better job, not that I could, 
but an expert.

Igor Roshchin wrote:
> Sorry, I don't have any experience with how PS does the HDR, 
> but I would naively assume that the same dilemma would be when
> you try to combine two (or whatever number) layers.
> Of course, masking a part of the photo would be the way out of it.
> Is this what you have in mind, or you are talking about some other
> mechanism that allows PS to resolve this issue in creating an HDR image?
>
> Thank you,
>
> Igor
>
>
> Thu Dec 6 14:53:59 EST 2007
> P. J. Alling wrote:
>
>   
>> The response curve will change similar tones everywhere.  For example 
>> you want to darken the sky, but some of the foreground has a patch of 
>> something the same general brightness of the sky, you don't want to 
>> change that.  Just changing the curve will effect both, in this 
>> hypothetical you need at least two layers. 
>>     
>
>   


-- 
The difference between individual intelligence and group intelligence is the 
difference between Harvard University and the Harvard University football team.

        -- P. J. O'Roarke


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