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Testing Ghostscript's PDF presets: /screen isn't always the smallest

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A developer of an open-source file converter compared three Ghostscript PDF compression presets, /screen, /ebook and /printer, on three sample files. For a synthetic high-resolution photo, /ebook produced a far smaller file than /screen, which kept lossless compression. A greyscale scan barely shrank under /ebook or /printer, and a text-only PDF actually grew under /printer, likely from font embedding. The author recommends inspecting a PDF's images before compressing, testing every preset, and keeping the original if the output is not smaller. The findings come from a few generated files, so results may differ with other versions and real documents.

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