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[EP-tech] Re: Dark or black Thumbnails

Further to Tim's advice, try to convert images on the server, from the command line and see what you get (black images or not). You can usually run: convert <input> <output> eg "convert pub.pdf images.jpg".
If you get black images from PDF documents, then try to upgrade Ghostscript. If you get black images when generating JPEG but not when generating PNG, perhaps a problem with libjpeg etc. 

Seb.

On 23/03/12 09:36, Carl-Johan Syrén wrote:

Hi.

Information about ImageMagick

root@eprints6:~# aptitude show imagemagick
Package: imagemagick
New: yes
State: installed
Automatically installed: yes
Version: 8:6.6.9.7-5ubuntu3
Priority: valfri
Section: graphics
Maintainer: Ubuntu Developers<ubuntu-devel-discuss@lists.ubuntu.com>
Uncompressed Size: 212 k
Depends: libc6 (>= 2.2.5), libmagickcore4 (>= 8:6.6.9.7), libmagickwand4 (>=
          8:6.6.9.7)
Recommends: libmagickcore4-extra, ghostscript, netpbm
Suggests: imagemagick-doc, autotrace, cups-bsd | lpr | lprng, curl, enscript,
           ffmpeg, gimp, gnuplot, grads, groff-base, hp2xx, html2ps, libwmf-bin,
           mplayer, povray, radiance, sane-utils, texlive-base-bin, transfig,
           xdg-utils, ufraw-batch
Conflicts: imagemagick
Provided by: graphicsmagick-imagemagick-compat
Description: image manipulation programs
  ImageMagick is a software suite to create, edit, and compose bitmap images. It
  can read, convert and write images in a variety of formats (over 100) including
  DPX, EXR, GIF, JPEG, JPEG-2000, PDF, PhotoCD, PNG, Postscript, SVG, and TIFF.
  Use ImageMagick to translate, flip, mirror, rotate, scale, shear and transform
  images, adjust image colors, apply various special effects, or draw text,
  lines, polygons, ellipses and Bézier curves. All manipulations can be achieved
  through shell commands as well as through an X11 graphical interface (display).
Homepage: http://www.imagemagick.org/

Regards

Carl Johan Syrén
Swedish University of Agricultural Sciences


-----Ursprungligt meddelande-----
Från: eprints-tech-bounces@ecs.soton.ac.uk [mailto:eprints-tech-bounces@ecs.soton.ac.uk] För Tim Brody
Skickat: den 23 mars 2012 10:01
Till: eprints-tech@ecs.soton.ac.uk
Ämne: [EP-tech] Re: Dark or black Thumbnails

On Fri, 23 Mar 2012 10:07:51 +0100, Carl-Johan Syrén
<carl-johan.syren@slu.se>  wrote:

Hi

We got a problem with dark or black thumbnails.
Anyone got a clue what to do about it ?

Hi,

What version of ImageMagick do you have?
convert -version