I have received a number of pdf files with images in them. The original images have been lost, so I need to extract them. I have Adobe Acrobat Pro, so I extracted them using
Advanced > Document Processing > Export All Images (there are four options: jpeg, png, tiff, jpeg2000). But, I'd like to extract them in the original format, and this is apparently not jpeg: I also tested pdfimages.exe from xpdf as outlined here, and this gave .ppm files, not jpeg.
So I tried ImageMagick's identify, what it gave me was this:
identify images-000.ppm images-000.ppm PPM 870x1181 870x1181+0+0 8-bit sRGB 3.082MB 0.000u 0:00.000
Does this indicate it was an embedded .bmp? How to tell? I would actually expect a function in Acrobat to identify the format of images, but I couldn't find it.
So, what is the best way to identify the image format of images in a pdf?
(I prefer extraction via Acrobat because of the batch functionality).