Saving every picture from a PDF in PDF by Zaweba
Pull out every image on a PDF's pages in one go: JPEGs saved exactly as they are and others as PNG, so photos come out at their full quality.

A brochure has the product photo you need, a report has the chart you want to reuse, and a catalogue holds a hundred pictures you would like as separate files. Screenshots of the page give you the picture plus everything round it, at screen resolution. Exporting the pictures themselves is far better.
PDF by Zaweba does this with File > Export > Every picture in the PDF. It saves each image on the pages. JPEGs come out exactly as they are, and other pictures are saved as PNG. Pictures inside form objects are not reached.
Why this beats a screenshot
The pictures inside a PDF are often stored at a higher resolution than you see on screen. A screenshot captures only what is displayed, at the size it is displayed. Exporting the images themselves gives you the full stored picture, usually much sharper.
JPEGs going out exactly as they are means no recompression. The photo you get is the same file that was put into the PDF, with no extra loss. Non-JPEG pictures are saved as PNG, which is lossless, so they lose nothing either.
Reusing figures and photos
Reusing your own material is the obvious one. If you made a brochure and the original photos are lost, exporting the pictures from the PDF gets them back.
Collecting figures from a report for a presentation is another. Charts and diagrams come out as separate files you can drop onto slides.
Checking what a document contains is a third. Exporting every picture shows quickly whether a PDF holds high-quality originals or small, compressed versions, which matters before you send something to print.
What it does not reach
Some PDFs place pictures inside form objects, which are reusable bundles of drawing that a page can call on. Pictures held that way are not reached by this export. If a picture you can see does not appear in the exported set, that is probably why.
For those, exporting the page as a picture is the fallback. File > Export can save the page as PNG, JPEG or TIFF at up to 600 dpi, and Crop pages beforehand lets you keep just the part with the picture.
Text drawn on the page and vector graphics such as lines and shapes are not pictures, so they are not exported either. A chart made of vector lines will need the page export route.
Sorting what comes out
Choose an empty folder for the export. A long document can hold many pictures, including small ones such as logos and icons repeated on every page, and an empty folder keeps them easy to sort.
Look through the results and delete what you do not need. Sort by size to put the big photos first and the tiny decorations last.
If you need the pictures at a standard size or format, open them in a picture editor afterwards. The export gives you the originals; resizing is a separate job.
A word on ownership
Exporting pictures is easy, but using them is a matter of rights. Your own documents and material you have permission to reuse are fine. Photos in a supplier's catalogue or someone else's report belong to them.
For what you are allowed to reuse, this export in PDF by Zaweba is the fastest way to get every picture out at full quality, in one go and without leaving your PC.