I mean something like a graphical interface / front end for Imagemagick or a simpler application that would allow converting/extracting images through the interface (not in the Terminal).
(The question poser added 'not in the terminal' only after I had posted this; however, it still stands as a relevant answer and useful for people, particularly regarding the
You can extract individual pictures from the pdf reader
To extract all images from a pdf, you can use
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A GUI to convert images to/from pdf is gscan2pdf.
It allows importing a pdf and saving images in (various) formats,
and also importing images and saving them in pdf-format
So, the program is able to convert between the following formats: pdf, gif, jpeg, png, pnm, ps, tif, djvu.