20

I'm trying to convert a PDF file (it's a book) into an image.

When I using convert like this

convert book.pdf book.jpg

or like this

convert book.pdf book.png

then I get this warning

Warning: Short look-up table in the Indexed color space was padded with 0's

for each page.

Is there some other tool I can use for conversion to get a bunch of images for this, or can someone show me a different way to solve this problem?

16
convert -geometry 1600x1600 -density 200x200 -quality 100 file.pdf file.jpg

When converting to jpg, you can use the -quality option. The "best" quality would be -quality 100.

There is a much simpler way to split multipage pdfs into a jpg:

convert -quality 100 -density 600x600 multipage.pdf single%d.jpg

    The -density option defines the quality the pdf is rendered before the convert > here 600dpi. For high quality prints you can increase that number.
    The %d just before the jpg suffix is for automatic numbering of the output pages 0,1,2...
    The -quality option defines the compression quality of the output jpg (0 min ... 100 max)
    The .jpg suffix defines the output format. You could use .png/.jpg/.pdf
16

One different way would be GhostScript:

gs -dNOPAUSE -dBATCH -sDEVICE=jpeg -r96 -sOutputFile='page-%00d.jpg' input.pdf

where -r96 is desired dpi resolution

Output are multiple JPEG images.

You can generate transparent PNGs also if you wish:

gs -dNOPAUSE -dBATCH -sDEVICE=pngalpha -r96 -sOutputFile='page-%00d.png' input.pdf
  • Very good method – Sabacon Feb 3 '12 at 13:36
  • 2
    +1 for not using imagemagick – TheHippo Aug 7 '12 at 14:16
  • How to make the background of the images white instead of transparent? – Rasoul Feb 4 '14 at 20:20
  • Don't use pngalptha device? – zetah Feb 4 '14 at 21:18
  • How to define width in this? Width needs to be defined and height needs to be auto based on aspect ratio. – Vivek Sancheti Mar 14 '16 at 6:32

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