pdf2png converts PDF files to various image formats with a simple graphical interface based on python, using ghostscript. It supports up to 4 different image extensions like PNG, JPEG, BMP and TIFF. Increasing or decreasing the resolution will change the image quality.
Once given correct numbers for the From page and To page, click on Select PDF file to open a dialog window to browse and select the wanted PDF book, and click on Convert to convert the selected pages. It would convert the pdf and output the image(s) in the same directory where the pdf resides.