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Comment: Add note about ImageMagick density

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Providing ICC profiles to ImageMagick is optional. If these configuration properties are unset, no profiles will be supplied to ImageMagick, and thumbnails produced from PDFs using the CMYK color space will also use CMYK. The transformation from CMYK to RGB is optional.

Override ImageMagick Default Density

It is possible to override ImageMagick's default density of 72 DPI when creating PDF thumbnails. This increases the quality of resulting thumbnails at the expense of slightly longer execution times and higher memory usage. Any integer over 72 will help, but recommend 144 for a "2x" supersample. See the following configuration option in dspace.cfg :

Code Block
# org.dspace.app.mediafilter.ImageMagickThumbnailFilter.density = 144

The effect is most notable on PDFs with a lot of text, gradients, or curved lines. See the pull request implementing this feature for more information and comparisons.

Additional Customization

The ImageMagick conversion software provides a large number of conversion options.  Subclasses of these media filters could be written to take advantage of the additional conversion properties available in the software.

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