Another setscreen puzzle.
- From: Ross Presser <rpresser@xxxxxxxxx>
- Date: Fri, 13 Jul 2007 16:32:25 -0000
An upcoming challenge for me is to generate a million or so bilevel
300dpi TIFFs for some laser production process. They want them
halftoned, using 95lpi, 45 degree, round dots. I believe I've
generated the correct thing when using postscript, and I'm waiting for
their signoff.
The trouble is that my input format is PDF, not postscript. I
generated my sample TIFF by inserting this line
<< /HalftoneType 1 /Frequency 95 /Angle 45 /SpotFunction { dup mul
exch dup mul add 1 exch sub } >> sethalftone
as the last line before %%EndSetup in the output from pdftops. That
is what worked.
So, is there a way to set a screen for ghostscript without converting
my pdf to postscript and editing it? I tried putting the line above
into setscreen.ps and running
gswin32c -dNOPAUSE -dBATCH -sDEVICE=tifflzw -r1200 -
sOutputFile=test.tif setscreen.ps input.pdf
but got the ordinary square dither, not a round dot halftone.
Any other ideas? Distiller parameters would seem not to be the right
place to look, since I'm consuming PDF and not generating it.
.
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