“Photo Shop, I don’t have it.”
Try Gimp, it is open source and free. For most things it is an excellent substitute for Photo Shop.
For 5-1/2 years I ran a catalog department and printed a 3,000 page catalog for a distributor and did their website images for 37,000 items. I had Creative Suite, but quit using Photo Shop or Illustrator. My default was Gimp.
Here is where you can download Gimp for Windows. (I use Linux)
The only problem you might have is integrating Ghostscript with Gimp. (for handling .pdfs directly) I did that on my last Windows computer but would have to do a little searching for that.
If you want to batch process a lot of image conversions ImageMagick is an amazing open source command line image processing app.
All of these are pretty standard Linux image manipulation programs.
