Bug 692273

Summary:	Dithering on grayscale output devices from color PDF
Product:	Ghostscript	Reporter:	Robert Cicconetti <grythumn>
Component:	Color	Assignee:	Michael Vrhel <michael.vrhel>
Status:	RESOLVED FIXED
Severity:	normal	CC:	grythumn
Priority:	P4
Version:	9.02
Hardware:	PC
OS:	Windows Vista
Customer:		Word Size:	---
Attachments:	8.63 output, page 22 of PDF 9.02 output, page 22 of PDF

Description Robert Cicconetti 2011-06-09 23:58:27 UTC

Source PDF:
http://www.archive.org/download/margaretvincentn00clifiala/margaretvincentn00clifiala.pdf

Command line:
gs -dNOPAUSE -dSAFER -dBATCH -sDEVICE=pnggray -sOutputFile=%03d.png -r300 -dFirstPage=20 -dLastPage=20 ../margaretvincentn00clifiala.pdf

Version 9.02 amd64 precompiled binaries for windows.

When outputting to pnggray (or tiffgray) outputs, the background color of the PDF is rendered as a dither. dBitsPerPixel, dGraphicsAlphaBits, dTextAlphaBits settings had no apparent effect.

8.63 outputted a smooth, low resolution background.

Comment 1 Robert Cicconetti 2011-06-09 23:59:22 UTC

Created attachment 7585 [details]
8.63 output, page 22 of PDF

Comment 2 Robert Cicconetti 2011-06-09 23:59:50 UTC

Created attachment 7586 [details]
9.02 output, page 22 of PDF

Comment 3 Michael Vrhel 2011-11-04 05:07:56 UTC

This has been fixed with 2b91a85069d421465220a83c82ea491733d15017 and
65486b6c7533f0be9e15a8380729fdb5032e0bef.