Bug 689910

Summary:	White lines with Altona-Testsuite_p2_S_x3.pdf
Product:	Ghostscript	Reporter:	Marcos H. Woehrmann <marcos.woehrmann>
Component:	Graphics Library	Assignee:	Robin Watts <robin.watts>
Status:	RESOLVED WORKSFORME
Severity:	normal
Priority:	P3
Version:	master
Hardware:	PC
OS:	Linux
Customer:		Word Size:	---
Attachments:	screenshot.png

Description Marcos H. Woehrmann 2008-06-16 19:42:26 UTC

While investigating the nightly regression report I came across a problem with
the rendering of Altona-Testsuite_p2_S_x3.pdf at 72 dpi.  There are white
horizontal lines within the gradient in the upper left hand corner.  Rendering
at higher (i.e. 80 dpi) or lower (i.e. 60 dpi) causes the white lines to
disappear.  Similarly they do not appear with Adobe Acrobat.

The command line I'm using:

  bin/gs -sDEVICE=ppmraw -r72 -o test.ppm Altona-Testsuite_p2_S_x3.pdf

Note that this isn't technically a regression, since I couldn't find a copy of
Ghostscript that ever rendered this image without the white lines.

Comment 1 Marcos H. Woehrmann 2008-06-16 19:44:14 UTC

Created attachment 4129 [details]
Altona-Testsuite_p2_S_x3.pdf

Comment 2 Marcos H. Woehrmann 2008-06-16 19:44:22 UTC

Created attachment 4130 [details]
screenshot.png

Comment 3 leonardo 2008-08-13 07:09:03 UTC

Can't reproduce. Please specify exact revision number.

I do see a difference appeared with revision 8790, but that difference is 
minor : a shift of white lines. It's an expected difference. The lines also 
visible with gs8.50 .

Returning to the author.

Comment 4 Kai-Uwe Behrmann 2008-09-09 04:03:44 UTC

I can confirm this appearance with gv in several resolutions (0.5 ... 2.0).

Comment 5 Marcos H. Woehrmann 2008-09-15 11:10:50 UTC

I've changed the title to to indicate this is not a regression,  The white lines shown in the screenshot do 
not appear when the file is opened in Acrobat or Apple Preview.

Comment 6 leonardo 2009-01-03 07:22:23 UTC

Downgrade the priority because it's not a regression.

Comment 7 Michael Vrhel 2011-06-12 00:06:40 UTC

More white lines in shadings for robin...

Comment 8 Robin Watts 2019-09-03 12:28:41 UTC

Having backtracked all the way to 9.00 I can't reproduce this any more. Therefore closing.