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https://issues.apache.org/jira/browse/SOLR-10298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15940451#comment-15940451
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Steve Rowe commented on SOLR-10298:
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bq. it's definitely not just an issue of image scaling – note cassandra's
comments about /FlateDecode – ghostscript is re-writting the postscript text
blocks to use compressed text.
Yeah, sorry for the noise, I obviously didn't comprehend what Cassandra wrote.
bq. here's a quick comparison I just did on the jira/solr-10290 branch...
Nice proof.
bq. At the moment everything we do in the adoc->pdf converstion is java only,
so it would be a bummer to add this external dep
I looked at pdfbox's examples, and none of them seem to be aimed at the sort of
cleanup we're after, so although it might work for us, I don't see a quick win
there.
> Reduce size of new Ref Guide PDF
> --------------------------------
>
> Key: SOLR-10298
> URL: https://issues.apache.org/jira/browse/SOLR-10298
> Project: Solr
> Issue Type: Sub-task
> Security Level: Public(Default Security Level. Issues are Public)
> Components: documentation
> Reporter: Cassandra Targett
>
> The new Ref Guide PDF is ~31Mb in size, which is more than 2x the current PDF
> produced by Confluence (which is 14Mb).
> The asciidoctor-pdf project has a script to optimize the PDF, mostly by
> scaling down images. When I run this tool on the new PDF, the size is reduced
> to ~18Mb. (More info on this script:
> https://github.com/asciidoctor/asciidoctor-pdf#optional-scripts).
> Some of the current image files are very large in size, so I believe that by
> scaling the images down, we can make the size smaller without adding a step
> in the build to run the optimize script programmatically (it also has a
> dependency on GhostScript, so it would be nice to not add another dependency
> if it can be avoided).
> The new PDF is also about 300 pages longer, but this issue is primarily
> concerned with file size. However, reducing the number of pages will also
> make it smaller. A few things that could be tried to reduce the # of pages:
> * Reduce font sizes
> * Increase page margins
> * Review options for when a forced page-break is used and modify if possible
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