Hi,

We have some pdfs with transparent background. When using ImageMagick to 
convert to jpg thumbnails, it has black background. I set 
org.dspace.app.mediafilter.ImageMagickThumbnailFilter.flatten = true 
in dspace.cfg, even add this line to ImageMagickThumbnailFilter.java in 
getImageFile method.

op.alpha("remove");

Doesn't seem to work.

We are on DSpace 6.3 and using ImageMagick 6.9.10-68, and GPL Ghostscript 
9.25 (2018-09-13) on redhat linux. 

Is there anyone knows how to solve this problem?

Thanks,
Ying

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