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https://issues.apache.org/jira/browse/SOLR-10298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15953689#comment-15953689
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Cassandra Targett commented on SOLR-10298:
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bq. Might be possible to scale the images using PDFBox too for further gains
I'm for the idea of scaling the images further, but we should also pay
attention to the size of the images to begin with. Before I scaled a number of
them down, some were nearly 500K and I can't think of a reason why a screenshot
needs to be at such high resolution.
Plus, keeping them smaller will keep bloat out of the source code, won't eat up
bandwidth in the online version trying to load, and help make the PDF even
smaller.
> 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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