Digital BW, The Print

Tiff at 16 bit.  I went back and redid it with the shadow warning on.  Seems
that the warning kicks in (when set to 0) well before the RGB (not red)
black point reaches any of the left most points of individual channel
histograms (is this understandable?  I mean I am adjusting the levels in RGB
but watching the 4 histograms overlaid on each other - RGB, R, G, and B).
The image is much better but the notion of visually dragging the RGB black
(and white) points to the edge of the histograms seems to be flawed.


> From: "Nick H. Nugent" <nghin@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Mon, 10 Jan 2005 21:08:10 -0000
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: [Digital BW] Re: Posterization in red channel
> 
> 
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Steve Kale"
> <stevekale@b...> wrote:
>> ... From the RAW file I used Capture One Pro with high
>> contrast setting and simply slid the RGB black point slider
>> up to the left of the red histogram and then processed
>> (no other adjustments).  In PS, I then used the split
>> channels technique to work up a B&W version.  The image
>> is of a sand dune against a dark (blue) sky.  My problem
>> is that the red channel appears (on screen - I have not
>> printed it yet) to be posterized in the sky....
> 
> Have you tried NOT adjusting the red histogram? Then what file format
> did you pass from Capture One to PS? What bit depth? I'm sure you may
> have already looked at these variables but if all are ok then may be
> it's just your monitor display properties. Just some thoughts.
> 
> --nick