It simply ignores any text or vector drawing commands in the PDF.Īs a result, if what you have is a PDF that's just a wrapper around a series of bitmaps, pdfimages will do a much better job of extracting them, because it gets you the raw data at its original size. Pdfimages looks through the PDF for embedded bitmap images and exports each one to a file. pdfimages does not do the same thing that convert does when given a PDF as input.Ĭonvert takes the PDF, renders it at some resolution, and uses the resulting bitmap as the source image. Update: As you pointed out, gscan2pdf (the way you're using it) is just a wrapper for pdfimages (from poppler). (You can prepend -units PixelsPerInch or -units PixelsPerCentimeter if necessary. Perhaps you need to use -density to do the conversion at a higher dpi: convert -density 300 file.pdf page_%04d.jpg Could you post some samples to illustrate? Perhaps cut the same section out of the poor quality and good quality versions (as a PNG to avoid further quality loss). That could mean a lot of different things. It's not clear what you mean by 'quality loss'.

Online pdf to jpg converter 600 dpi