5105Re: Halftones and photopolymer
- Dec 19, 2005When setting up halftone images in Photoshop, I generally do flatten
the image a bit (reducing the contrast) as you tend to gain contrast
through the halftone process. In whatever program you are using, you
need to make certain that you have at least a good 10% dot in the
highlight, and a 90% dot in the shadow. If you start to lose either
end, the image starts to become very muddy and or spotty in appearance.
I was always taught that dropouts (no dot at all) were OK
in "specular" highlights. That is areas in which you would expect no
density at all such as bright reflections. It seems to me that dropped
dots become very obvious when dealing with line screens under 133
lines/in., and dropouts should be avoided if possible.
In my opinion, a 20% dot would be too heavy for something which has
detail in the highlights you wish to keep, but experience with various
papers and images is the best teacher. Most recently I have been
printing halftone images for miniature books, where the images are
small and detail is important. At 133-line screen, with coated paper,
it is surprising what detail can be resolved. Even after considerable
experience with the process, I am still frustrated on occasion with
the results. More often than not, however, control of the process
leads to better images.
John G. Henry
Cedar Creek Press
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