[Pkg-gmagick-im-team] Bug#737003: conversion to pdf silently fails for big paper formats

[chrysn]

Package: imagemagick
Version: 8:6.7.7.10-7
Severity: normal
File: /usr/bin/convert

when using `convert` to create a pdf file from a pixel graphic, and the
resulting pdf is physically larger than 900000pts, `convert` fails
silently by outputting an empty letter-sized pdf.

admittedly, creating 300m large pdf files is usually not intended, but
can easily happen when taking high-res images (think stitched panoramas,
18000x3000px can be realistic there) and converting them to pdf with the
default resolution (`convert DSC_1234-DSC1249.jpg
DSC_1234-DSC1249.pdf`). for an easier to reproduce setup, try this:

$ convert -size 100x100 xc:white small.png
$ convert small.png -density 0.007 small.pdf
$ pdfinfo small.pdf
[...]
Page size:      612 x 792 pts (letter)
[...]

at resolution 0.008dpi, instead it gives

Page size:      900000 x 900000 pts

which is expected.

if this is a limitation of the output format, please have convert exit
with an error (and ideally a message that suggests using a higher
`-density`).


as a workaround, mechanisms that deal with converting images
automatically can set high pixel densities (but must not go too hight,
because:

$ convert small.png -density 80000000 small.pdf
$ pdfinfo small.pdf
[...]
Page size:      612 x 792 pts (letter)
[...]

)

-- System Information:
Debian Release: jessie/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.12-trunk-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages imagemagick depends on:
ii  hicolor-icon-theme  0.13-1
ii  libbz2-1.0          1.0.6-5
ii  libc6               2.17-97
ii  libfontconfig1      2.11.0-2
ii  libfreetype6        2.5.2-1
ii  libglib2.0-0        2.38.0-1
ii  libgomp1            4.8.2-14
ii  libice6             2:1.0.8-2
ii  libjpeg8            8d-2
ii  liblcms2-2          2.2+git20110628-2.3+b1
ii  liblqr-1-0          0.4.1-2
ii  libltdl7            2.4.2-1.6
ii  liblzma5            5.1.1alpha+20120614-2
ii  libmagickcore5      8:6.7.7.10-7
ii  libmagickwand5      8:6.7.7.10-7
ii  libsm6              2:1.2.1-2
ii  libtiff5            4.0.3-7
ii  libx11-6            2:1.6.2-1
ii  libxext6            2:1.3.2-1
ii  libxt6              1:1.1.4-1
ii  zlib1g              1:1.2.8.dfsg-1

Versions of packages imagemagick recommends:
ii  ghostscript           9.05~dfsg-8+b1
ii  libmagickcore5-extra  8:6.7.7.10-7
ii  netpbm                2:10.0-15+b2
ii  ufraw-batch           0.19.2-2

Versions of packages imagemagick suggests:
pn  autotrace                            <none>
ii  cups-bsd [lpr]                       1.7.1-2
ii  curl                                 7.34.0-1
pn  enscript                             <none>
ii  ffmpeg                               6:0.8.8-1
ii  gimp                                 2.8.6-1
ii  gnuplot                              4.6.4-1
pn  grads                                <none>
ii  groff-base                           1.22.2-4
pn  hp2xx                                <none>
pn  html2ps                              <none>
pn  imagemagick-doc                      <none>
pn  libwmf-bin                           <none>
ii  mplayer                              2:1.0~rc4.dfsg1+svn34540-1+b2
pn  povray                               <none>
pn  radiance                             <none>
ii  sane-utils                           1.0.24-1.1+b1
ii  texlive-binaries [texlive-base-bin]  2013.20130729.30972-2+b2
ii  transfig                             1:3.2.5.e-1
ii  xdg-utils                            1.1.0~rc1+git20111210-7

-- no debconf information

-- 
To use raw power is to make yourself infinitely vulnerable to greater powers.
  -- Bene Gesserit axiom
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