[gs-bugs] [Bug 692339] New: Wrong screening for 40 lpi

[bugzilla-daemon at ghostscript.com]

http://bugs.ghostscript.com/show_bug.cgi?id=692339

           Summary: Wrong screening for 40 lpi
           Product: Ghostscript
           Version: 9.02
          Platform: PC
        OS/Version: Windows XP
            Status: UNCONFIRMED
          Severity: normal
          Priority: P4
         Component: Graphics Library
        AssignedTo: support at artifex.com
        ReportedBy: leonidas at luciddream.com
         QAContact: gs-bugs at ghostscript.com
          Customer: Lucid Dream Software Inc.


Created an attachment (id=7663)
 --> (http://bugs.ghostscript.com/attachment.cgi?id=7663)
Source file for tests

I have problems with tiffsep1 device if I set screening frequency to 40 lpi. 39
and 41 lpi are ok.

I use follow command line:

gswin32c -dBATCH -dSAFER -dNOPAUSE -sDEVICE=tiffsep1 -r1200x600
-sOutputFile=ltt-40.tif kst-40.ps LucidTrapTest.pdf

All output separations except Yellow have wrong screening.

I tried resolution 1200 dpi instead of 1200x600. In this case Cyan and Magenta
separations are wrong. Other separations seems to be ok.

Note. kst-40.ps is my initialization file. I attach it (and files for 39 and 40
lpi too)

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