RE: Dpi and line screen
RE: Dpi and line screen
- Subject: RE: Dpi and line screen
- From: "Gordon Pritchard" <email@hidden>
- Date: Sun, 1 Jan 2006 12:07:32 -0800
- Thread-topic: Dpi and line screen
For halftone screening purposes, all that matters is that the resolution
of the halftone screen does not resolve the pixels that make up the
source image. The break-over point to avoid pixelatio is one-to-one.
I.e. 150 dpi for 150 lpi. You can confirm this yourself if you have
access to a halftone printer (e.g. b&w laser printer.) Use a source
image at 100% at 72 dpi. Print it to your printer at 36 lpi, 72 lpi, 144
lpi, and 288 lpi. There won't be any difference between the 36 lpi (2x)
and 72 lpi (1 - 1). However the 144 lpi and/or the 288 lpi may resolve
the pixels of the original 72 dpi image.
Incidently, most commercial printer's workflows are set, by default to
re-res images to 300 dpi - irrespective of the lpi that will be used.
That can cause artifacts if the image is up-resed or de-resed in the
RIP.
For a 20 micron FM screen the typical res of the source image is 400
dpi.
For a 10 micron FM screen the typical res of the source image is 4-600
dpi.
Thx, gordon pritchard
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