How to shrink/compress embedded pictures in existing pdf?

[mattad]

Assume I printed previously a picture or a OCR scanned magazine article page into a pdf document.

For some reasons I think now the resolution (and hence the size of the pdf doc) of the embedded picture is too big. In order to reduce the pdf file size I want to shrink/compress the embedded picture. For example I OCR scanned the magazine page with 600 dpi and I want to compress it as if I would have scanned it with only 300 dpi.

How can I do this with XChange Viewer (pro)?

Additonally it would be fine to have a menu/function to convert an embedded colored picture into a grey scale of even black/white picture.

Are there somewhere functions/menus for compress/converting embedded pictures?

If not: Could you add these features in the next release?

Thank you
Matt

[Stefan - PDF-XChange]

Hello Matt,

There aren't any direct image manipulation functions in our Viewer yet - but we are working on some such for addition in the future.

At this time you can "reprint" the file through our Standard printign drivers and select the maximum image resolution (and force downsampling any larger images), and you can also select to print as greyscale directly from the Viewer or set the downsampling to be to black and white only images in the driver's settings.

Alternatively you can try to extract the images from your original file with our PDF Tools - then process them in an external image manipulation tool and then create new PDF files from these images with our Viewer/Tools.

Best,
Stefan