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[OM] Display clipping in PS [was Maine Clouds - 2]

Subject: [OM] Display clipping in PS [was Maine Clouds - 2]
From: Moose <olymoose@xxxxxxxxx>
Date: Thu, 09 Aug 2007 16:32:15 -0700
Chuck Norcutt wrote:
> I there someway to display highlight and shadow clipping in PhotoShop? 
> I finally figured out how to do it in raw conversion even though it's 
> not documented that I can find.  
You just click the little Shadows and/or Highlights boxes above the 
preview image. Seems pretty obvious to me.

Try PS help, search for highlight clipping and the first entry is 
"Camera RAW view controls". That seems documented to me.
> However, how to do it in PhotoShop is still evading me.
>   
I'm not sure there is a flashing option of some such. I use the 
histogram, which is pretty clear and easy. I always have the little one 
up in the corner of the screen and use CTRL-L when I want more detail.

It has a pretty good system for showing areas that are out of the color 
gamut of the intended output device. I can see, for example, any colors 
that won't reproduce correctly on the R1800 with Premium Lustre Paper.
++++ break to play++++
OK, I just figured out how to do it with an Action:

A. Create a saved color selection to select pure white.
1. Create an area of pure white; select and fill, extend canvas, etc.
2. Select=>Color Range
3. Click the little dropper on the pure white area.
3. Set Fuzziness to zero.
4. Click Save and save with a name that makes sense to you.
5. Click OK.

B. Create an action to select and highlight pure whites.
1. Start recording a new Action, I called mine 100% White.
- Optional, create a dup layer with an appropriate name.
2. Select=>Color Range
3. Click Load and pick the file created above.
4. OK
5. Edit=>Fill (Shift-F5)
6. Click Color and pick from the Pallette. I went with red.
7. Select=>Deselect (Ctrl-D) (Or create Layer Mask.)
8. Stop recording the macro.

You now have an Action that will color all areas of pure white a 
different color, in my case, red in two clicks, (Quicker than some menu 
selections.). If you create a duplicate layer as part of the process, 
you can use it as a reference, to create a mask, etc., and delete it 
later when through. Same creation process for a black finder.

This will, of course, pick up any areas that just came up to 
255,255,255, as well as those that would have gone higher, if possible, 
but were clipped. Unlike ACRS, you can't slide stuff back and forth 
across the end, that decision has already been made by the time the 
image is in PS. But it will work to see where something like sharpening 
or LCE has clipped. Shadow/Highlights has its own black and white point 
settings to control clipping.

This Action also won't detect pixels where one channel is at 255, but 
the others aren't, which can cause color shifts at the limit. I haven't 
figured out how to do that, but you can see how much problem there may 
be with Levels and selection of one channel.

Moose

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