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https://issues.apache.org/jira/browse/PDFBOX-3844?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16071957#comment-16071957
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Tilman Hausherr commented on PDFBOX-3844:
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I'm sorry, I didn't notice that you were the same person.
There is no jpeg compression from CMYK BufferedImage objects out of the box,
i.e. java ImageIO doesn't support it, and we don't have the skills, so that
I'll have to close as "won't fix" this time.
But have a look at https://github.com/haraldk/TwelveMonkeys/ , he mentions that
"Extended write support in progress" for "CMYK JPEGs". It's unclear if it is
partially available or not yet at all, there's an issue:
https://github.com/haraldk/TwelveMonkeys/issues/25
Besides that, you could also try ImageMagick through a java interface, e.g.
http://im4java.sourceforge.net/ .
> Is there jpeg-compression of images?
> ------------------------------------
>
> Key: PDFBOX-3844
> URL: https://issues.apache.org/jira/browse/PDFBOX-3844
> Project: PDFBox
> Issue Type: New Feature
> Reporter: Mikhail Semionenko
> Attachments: Screen Shot 2017-06-30 at 12.16.02.png, Screen Shot
> 2017-06-30 at 15.39.45.png, Screen Shot 2017-06-30 at 15.47.46.png
>
>
> If you add large images in PDF, the resulting document becomes large. I've
> added about 80 images in size 2100x2100px in the document, and got about
> 400-500mb in the PDF file.
> From the document analysis (attached screen shot from Acrobate Pro DC), you
> can see that zip / flate compression is used for added images. I would like
> to be able to compress images in a document using jpeg compression (something
> like industry-standard compression filters). Is there such an opportunity
> now? Can it be add in the future?
> P.S. RGB and CMYK images are used.
> Thanks.
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