[OM] Re: HDR? [was] Digital Black and White

Subject: [OM] Re: HDR? [was] Digital Black and White
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Mon, 13 Aug 2007 06:52:26 -0400
Thanks.  That was clearly a lot of work.

Chuck Norcutt

Moose wrote:
> Chuck Norcutt wrote:
>> You lost me here.  Explain: "I simply set ACRS to retain all the
>> detail in the RAW file within the output range. I then processed that
>> one image as usual."
> Sure. With this image, settings were:
> Exposure: -1.65
> Shadows: 0
> Brightness:- 93
> Contrast: -30
> Curve: linear.
> The result is not a particularly good looking image, quite dark. But, 
> there are only a few clipped brightness values on either end. So the 
> data may not be correctly arranged, but it's all there. I suppose it 
> would be possible to do some of the further adjustment in ACRS, with 
> Curves in 3.3 and whatever may have been added since, but I am simply 
> more experienced and comfortable with the tools in PS and some are 
> unique to it.
> You can see what's going on in these examples. I've refined the clipping 
> identification Actions to roughly equal what shows in ACRS. You can see 
> the large amount of clipping at both ends in the default version. In the 
> custom version based on the above settings, although it is dark overall, 
> you can see that there is only one small area of blue in the cave and 
> that there are a few irretrievably lost highlights at the top of the 
> falls and in a couple of spots at the base. (The differences in the size 
> and shape of the red areas in the custom and final versions are not 
> 'real', but the result of applying the Action at full size on one and to 
> the downsized version on the other, sorry.)
> http://www.moosemystic.net/Gallery/tech/Process/hdrq/hdr2.htm
> Notice also how many small blown areas there are on the default rock 
> face, altering its color as channels top out unevenly.
> In the current version, I've let some areas of shadow go black in 
> processing for the effect I like, but you can see that is not necessary 
> from the custom ACRS version.
> One thing that I think has to be learned to get the most out of PS is 
> that some steps make the image look worse, before later ones make it 
> look better. If you want improvement at each step, you limit what you 
> can do.
> Moose
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