You can probably shave down which images you want by excluding very small ones. On my Mac, this search produces 171,499 images, and dragging and dropping that many images can cause the system to rainbow-spin for a long time or even lock up.
You can create a smart folder that grabs all images indexed by Spotlight. Drag the selection to the new destination.In the results window, click and then press Command-A or choose File > Select All.Set up the destination to which you want to copy all images, like a folder or hard drive.
You can click the Action (gear) menu and choose Show Search Criteria to display them.) (When you click Save after naming, the criteria disappear and the Smart Folder icon and name appear the top of the window. Name it something like “Find all images by type”. Click the Save button in the upper right so you can recall these criteria if something goes wrong.Repeat step 6 for GIF and PNG (and BMP, if you think you have any of that format, primarily used in Windows).Click the + at the end of that line, and create a field with Kind, Image, and TIFF.Under Any, change the pop-up buttons to Kind, Image, and JPEG.Any is the right selection, so you can leave that alone. The ellipsis button creates an Any of the Following Are True entry, which is what you need to have multiple criteria for images in a single search.
Now hold down the Option key, and the plus button in the upper right next to the entry that was created (which starts “Name” and “matches”) changes to an ellipsis (…).In the upper-right corner, click the plus (+) button.