Extract images from a PDF
This is not a screenshot of the page. It reaches into the file for the actual image objects that were embedded in it and writes each one out at the resolution it was stored at.
These are the original embedded images at their stored resolution — not screenshots of the page. Bullets, rules and icons are images too, which is what the size filter is for. Vector charts and logos are drawing instructions rather than images, so they cannot be extracted.
The document's drawing operations are scanned on your device for image references.
Bullet points, rules and icons are images too. Filtering out anything below about 64 pixels usually leaves just the pictures worth having.
Each image is decoded and written as a PNG, named with the page it came from.
A single image comes back on its own; several arrive as a ZIP.
A photograph placed small on a page may be stored at 4000 pixels wide. Rendering the page would give you the small version; extracting gives you the original. That is the whole reason to use this rather than PDF to JPG.
Charts, logos and diagrams drawn as vectors are drawing instructions, not pictures, so there is nothing to extract. To get a picture of them, render the page with PDF to JPG and crop.
Images inside a PDF are stored in a variety of encodings, some with masks and unusual colour spaces. Decoding them and re-writing as PNG is lossless and gives you files that open everywhere, at the cost of larger files than the original JPEGs.
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