Re: Dpi and line screen
Re: Dpi and line screen
- Subject: Re: Dpi and line screen
- From: "jc castronovo" <email@hidden>
- Date: Sun, 1 Jan 2006 10:28:58 -0500
----- Original Message -----
From: "Ken Fleisher"
On Dec 31, 2005, at 10:38 AM, jc castronovo wrote:
Right. With photographic printing, every pixel can be any color. We don't
have to simulate colors by placing four colored dots around in a pattern,
so we don't need to sample those dots from a larger field of resolution.
Well, actually, with photographic printing, "any color" is simulated by
placing three, not four, colors around in a pattern (just not a halftone
pattern). The primaries are different and the method is different, but the
principle is the same. In other words, "every pixel can be any color" is
not a correct statement. You are still limited by the primaries being
used.
Granted, I understand that we're still printing with primaries, but this
happens on a molecular scale such that you can get variations of the amount
of magenta dye for example. With dot screen printing, we print rather gross
sized solid dots of any single color of ink, and they're always the same
shade of maximum density. With only four inks to play with, they need to
varied in size and placement to get variations.
With photo printing, each pixel can be any color without such mechanical
means. Even though there are only three dyes, the molucules are mixed and
overlayed in the emulsion. Whether you need a pink or purple colored pixel,
you get a solid area of that color without having to break it up into dots
to simulate a color you can't print. Consider the difference between a black
and white photographic print and a halftone reproduction of it. Without a
microscope, there are no discernable dots on the photo print and any area
can be the shade of gray that it needs to be, even though it's all the same
black silver. It's a question of degree to be sure, but the differences in
scale are huge.
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