Follow the steps to understand the extraction of images from PDF
Download, install and run the PDF Image Extractor Tool and read all the instructions there.
From Select Files or Select Folders options, add the required PDF document files / folders to extract all images from PDF. Upload files using appropriate option.
The PDF Images Extractor will show the detail of added folders along with the number of Images Found in each PDF file. Click on the Next button.
Select the destination path where you want to extracted images.
Then, click on Convert button to save the embedded images with attachments.
The extraction of images from PDF will start and you can see the live process running on the screen.
After that, you can be able to see the final extraction message on the screen. Click on OK button.
Lastly, a box will appear saying that the trial version will extract first 5 PDF files and only one image per PDF document.