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Actually the masked images are there but are extremely light
so almost impossible to see.
You can change the "glyph embolden" option to the max;
then the images can be seen but still they are too light.
One option would be to change the pdf into a black&white bitmap
(e.g. use pdfcompressor).
Or, even better, convert it in djvu (use pdf2djvu, which is freeware).
V.
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