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Bug 507400 - inappropriate smoothing of bitmap images scaled way up
inappropriate smoothing of bitmap images scaled way up
Status: RESOLVED DUPLICATE of bug 445797
Product: evince
Classification: Core
Component: general
2.20.x
Other Linux
: Normal normal
: ---
Assigned To: Evince Maintainers
Evince Maintainers
Depends on:
Blocks:
 
 
Reported: 2008-01-05 01:04 UTC by Josselin Mouette
Modified: 2008-01-13 11:30 UTC
See Also:
GNOME target: ---
GNOME version: 2.19/2.20


Attachments
PDF file showing the issue (4.53 KB, application/pdf)
2008-01-05 01:05 UTC, Josselin Mouette
Details
EPS file showing the issue (11.54 KB, image/x-eps)
2008-01-05 01:06 UTC, Josselin Mouette
Details

Description Josselin Mouette 2008-01-05 01:04:19 UTC
[ Forwarded from http://bugs.debian.org/454550 by Zack Weinberg ]

The attached PDF and EPS files are a rendering as a grayscale bitmap
(plus some text) of a 10x10 matrix.  Each bit in the matrix is intended
to produce a gray square with crisp edges; this is how ghostscript renders
it, and how every printer I've tried renders the original EPS file.

evince, however, applies some kind of smoothing operation to the scaled
bitmap, rendering it completely illegible.  It does this to both the PDF
and the EPS versions.

This appears to be intentional - at least, I see that when evince invokes
gs to render the EPS file, it is deliberately passing -dDOINTERPOLATE, which
produces this behavior if I run gs by hand - but I beileve it to be wrong,
because it is inconsistent with the behavior of printers and the behavior
of other PostScript/PDF renderers.
Comment 1 Josselin Mouette 2008-01-05 01:05:39 UTC
Created attachment 102192 [details]
PDF file showing the issue
Comment 2 Josselin Mouette 2008-01-05 01:06:11 UTC
Created attachment 102193 [details]
EPS file showing the issue
Comment 3 Carlos Garcia Campos 2008-01-13 11:30:17 UTC
Thanks for taking the time to report this bug.
This particular bug has already been reported into our bug tracking system, but we are happy to tell you that the problem has already been fixed. It should be solved in the next software version. You may want to check for a software upgrade.


*** This bug has been marked as a duplicate of 445797 ***