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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.


On 23/03/12 09:36, Carl-Johan Syr?n wrote:
> Hi.
> Information about ImageMagick
> root at eprints6:~# aptitude show imagemagick
> Package: imagemagick
> New: yes
> State: installed
> Automatically installed: yes
> Version: 8:
> Priority: valfri
> Section: graphics
> Maintainer: Ubuntu Developers<ubuntu-devel-discuss at lists.ubuntu.com>
> Uncompressed Size: 212 k
> Depends: libc6 (>= 2.2.5), libmagickcore4 (>= 8:, libmagickwand4 (>=
>           8:
> 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 B?zier 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 Syr?n
> Swedish University of Agricultural Sciences
> -----Ursprungligt meddelande-----
> Fr?n: eprints-tech-bounces at ecs.soton.ac.uk [mailto:eprints-tech-bounces at ecs.soton.ac.uk] F?r Tim Brody
> Skickat: den 23 mars 2012 10:01
> Till: eprints-tech at ecs.soton.ac.uk
> ?mne: [EP-tech] Re: Dark or black Thumbnails
> On Fri, 23 Mar 2012 10:07:51 +0100, Carl-Johan Syr?n
> <carl-johan.syren at 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