eprints_tech messages

From: "Dennis - UT" <dv.eprints AT gmail.com>
Date: Thu, 6 Nov 2008 17:03:54 +0100

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I just installed ImageMagick on the server for non-EPrints usage and
thought: why not get those thumbnails working as well. I was suprised by the
filesize of these thumbnails (actually I wasn't since I already read about
it on the EPrints lists before). There's a very simple way to reduce the
thumbnail size though, just one small change in
/perl_lib/EPrints/Plugin/Convert/ImageMagick/ThumbnailDocuments.pm

From:
system($convert, "-thumbnail","400x300>", ↵
'-bordercolor',
'rgb(128,128,128)', '-border', '1', $src.'[0]', $dir . '/' . $fn);
To:
system($convert, "-thumbnail","400x300>", ↵
'-bordercolor',
'rgb(128,128,128)', '-border', '1', $src.'[0]', *'PNG8:'.*$dir . '/' . $fn);

The added PNG8: forces it to use 256 color PNG format instead of 16 million
colors. I tried it with one PDF, the filesize decreased from 160kb to 20kb
without any visual changes (it's only a thumbnail after all). Small code
change, huge space savings ;-)

Dennis
University of Twente

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