: Re: High resolution small-size pdf PDFs on archive.org are in high resolution yet has relatively small size. For example, this book. The book's resolution is 500 ppi and 46 Mb size. What I did

@Jamie

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They are small, because their content is largely just plain text (including equations).

Since they are directly generated from source files (e.g. LaTeX or Microsoft Word documents), the text is as embedded as a bunch of strings in the .pdf.

If you instead have a document and scan it to .pdf, the pdf just contains one large image per page. This is much less efficient comparing the amount of needed disk space.

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