Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "esharamaki"
<esharamaki@...> wrote:
>
> Can someone direct me to a web page where I might find a fairly
> detailed tutorial on using/modifying Photoshop curves for use in
> controlling ink positions?  I get it on a very high level but in terms
> of nuts and bolts on how to choose/tweak points in each channel is
> beyond me.
> 
> Thanks,
> Earl
>

Earl,

I'm not sure what you mean by ink "positions".  I assume you are
looking for a way to use curves in individual channels to balance
color and control contrast.  

This isn't exactly a tutorial, but it is a chapter from a book that
discusses the use of curves in individual channels for correcting
color and contrast.  He avoids the use of composite curves (ie, the
master RGB or CMYK curve, for example).  This method can be used in
RGB, CMYK or Lab.  It is fairly in-depth and effective, but takes
practice.  The essence is selecting appropriate highlights, shadows,
known colors or neutrals (using the info palette in Photoshop) or
inferring which colors are incorrect, then adjusting them so they are
within reason.  

Dan Margulis is a controversial figure, and while I don't agree with
some of his positions, he has a tremendous amount of usable and
effective knowledge.  The below is a link to some free chapters in PDF
format.  Click the link for Chapter 3 - Color by the Numbers, from
Professional Photoshop 5th Edition.  

http://www.ledet.com/margulis/articles.html


I hope this is what you were looking for.  

Lou