Digital BW, The Print

Nice, Carl.  I think there's probably an issue about how accurate ink blending
really is i.e. is the 50% point of a 50/50 blend exactly the average of the two?

Roy

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Carl Schofield <scho@m...> 
wrote:
> 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.
> >
> 
> 
> 
> [Non-text portions of this message have been removed]