Original images can be downloaded from your bookmarks. Collect bookmarks from specifed folder using "record" feature. On pinterest you can download all images from specifed collection or other list by using KellyC image downloader tool. If you want to download full size (originals) images instead of previews, you need to be logged in on Pinterest before begin.
Using the steps in this tutorial, you can download any number of images in full size or previews only from a specific collection, or list on Pinterest
1. Install KellyC Image Downloader extension
2. Go to any Pinterest collection page and click on extension icon
3. Press "Record" button - number of captured images will appear on bottom of page. Scroll or navigate through needed pages - all images during record will be captured, you can later filter unnecessary images before actual download
4. When all required information is scrolled - click on extension icon again an click "Stop record" -> "Download record"
5. If you logged in to your account on Pinterest, full size original images already will be added to images list automaticly
6. For download collected images press "Download" -> "Start download"
Video example
Common example for Pinterest to capture all data from user bookmarks
Source code of pinterest and other filter implementations for extension can be found here
See also other site support examples and videos
You can help with improvement extension by sending feedback, or share information somewhere, also addition instructions always welcome on extension subreddit