Digital BW, The Print

Roy,

Thanks for the info on simulating QTR blending.  I just tried it and 
compared the simulated blend to an icc soft-proof profile of a QTR 
blend and they were reasonably close in appearance.  Here is a screen 
grab (Adobe RGB tagged) of an RGB simulation of a 50% sepia and 50% 
warm profile blend (made as you described below) on the right and the 
original gray image on the left with an active icc soft-proof profile 
of the same 50:50 blend.
http://homepage.mac.com/scho/comparison.jpg
If one didn't want to make icc profiles for a lot of blends, then this 
would be an easy way to get close with a simulation from just two 
profiles.  Should be possible to make an action to do the simulation 
quickly.

Carl
On Thursday, January 15, 2004, at 08:27  PM, Roy Harrington wrote:
snip..

> Actually the blend issue is an interesting topic and this may actually 
> help=
>
> in understanding profile usage.
>
> It's a little work but you can make two layers -- one from each 
> profile --
> and vary the opacity of the top layer to simulate QTR blending.   You
> can't have two profiles in one file so you need to do the effect of 
> each
> profile and get back to a common profile.
>
> 1) you should have settings: gray gamma 2.2 and Adobe RGB
> 2) take Grayscale and Duplicate it, conver to RGB and duplicate again.
>     -- now you have two Adobe RGB files with gray image.
> 3) take one RGB file and Assign to Profile:  ICC Profile 1 (warm) and
> then Convert to Profile: Adobe RGB  -- Relative Colorimetric and Black 
> Poin=
> t set.
> 4) take the other and Assign ICC Profile 2 (cold) and Convert to Adobe 
> RGB =
> too
> 5) now Select All, Copy one image, and Paste onto second.
>
> You now have two layers and vary the opacity.  Also look at the RGB
> values of each layer separately and combined.
>
> If you follow all the changes -- number wise (RGB values) and color
> wise on the display, it may help see what goes on behind the scene.
>



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