Bug#454550: inappropriate smoothing of bitmap images scaled way up

[Zack Weinberg]

Package: evince
Version: 2.20.2-1
Severity: normal

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.

-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)

Kernel: Linux 2.6.22-3-686 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages evince depends on:
ii  gconf2             2.20.1-1              GNOME configuration database syste
ii  ghostscript [gs-es 8.61.dfsg.1~svn8187-3 The GPL Ghostscript PostScript/PDF
ii  gnome-icon-theme   2.20.0-1              GNOME Desktop icon theme
ii  libart-2.0-2       2.3.19-3              Library of functions for 2D graphi
ii  libatk1.0-0        1.20.0-1              The ATK accessibility toolkit
ii  libbonobo2-0       2.20.1-1              Bonobo CORBA interfaces library
ii  libbonoboui2-0     2.20.0-1              The Bonobo UI library
ii  libc6              2.7-3                 GNU C Library: Shared libraries
ii  libcairo2          1.4.10-1.1            The Cairo 2D vector graphics libra
ii  libdbus-1-3        1.1.2-1               simple interprocess messaging syst
ii  libdbus-glib-1-2   0.74-1                simple interprocess messaging syst
ii  libdjvulibre15     3.5.19-3              Runtime support for the DjVu image
ii  libgconf2-4        2.20.1-1              GNOME configuration database syste
ii  libglade2-0        1:2.6.2-1             library to load .glade files at ru
ii  libglib2.0-0       2.14.4-2              The GLib library of C routines
ii  libgnome-keyring0  2.20.2-1              GNOME keyring services library
ii  libgnome2-0        2.20.1.1-1            The GNOME 2 library - runtime file
ii  libgnomecanvas2-0  2.20.1.1-1            A powerful object-oriented display
ii  libgnomeui-0       2.20.1.1-1            The GNOME 2 libraries (User Interf
ii  libgnomevfs2-0     1:2.20.1-1            GNOME Virtual File System (runtime
ii  libgtk2.0-0        2.12.3-1              The GTK+ graphical user interface 
ii  libice6            2:1.0.4-1             X11 Inter-Client Exchange library
ii  libjpeg62          6b-14                 The Independent JPEG Group's JPEG 
ii  libkpathsea4       2007.dfsg.1-2         TeX Live: path search library for 
ii  libnautilus-extens 2.20.0-2              libraries for nautilus components 
ii  liborbit2          1:2.14.7-0.1          libraries for ORBit2 - a CORBA ORB
ii  libpango1.0-0      1.18.3-1              Layout and rendering of internatio
ii  libpoppler-glib2   0.6.2-1               PDF rendering library (GLib-based 
ii  libpopt0           1.10-3                lib for parsing cmdline parameters
ii  libsm6             2:1.0.3-1+b1          X11 Session Management library
ii  libstdc++6         4.2.2-4               The GNU Standard C++ Library v3
ii  libtiff4           3.8.2-7               Tag Image File Format (TIFF) libra
ii  libx11-6           2:1.0.3-7             X11 client-side library
ii  libxml2            2.6.30.dfsg-3         GNOME XML library
ii  zlib1g             1:1.2.3.3.dfsg-7      compression library - runtime

evince recommends no packages.

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