Yahoo Groups archive

Digital BW, The Print

Index last updated: 2026-04-28 22:56 UTC

Message

Highlight "posterization" or blotchiness with VM curves

2002-07-10 by Paul Roark

I had some trouble with printing some smooth clouds in a print on the 3000
with the VM-S neutral curve.  With the 21-step test file that has 1%
increments for the top (and bottom) 5% range, I found that the spacing was
not even.  (0% - 5% = .04, .05, .05, .06, .07, .09)  I have noticed and
fixed this with a few of the curves out there, but not all.  With
adjustments to the 3000's curves I was able to get a perfect spacing of 0.4
(paper white), .05, .06, .07, .08, and .09.  This made a significant
difference in the final print highlight smoothness.

If you have blotchy highlights with vm curves, let me know which curves are
the problems, and I'll just apply the same remedy to them that worked for
me, and we'll see if that makes a difference.

Paul
http://www.PaulRoark.com

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.