[poppler] Command line pdf to high resolution jpegs conversion?

[D***@terra.es]

I am looking for a way to convert a pdf to high resolution jpegs to read
pdfs at my digital camera.

Do you know of any opensource (command line) program that can convert
pdfs to jpegs (maybe using poppler)?



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[Martin Schröder]

Post by D***@terra.es
Do you know of any opensource (command line) program that can convert
pdfs to jpegs (maybe using poppler)?

The next time try Google first.

convert (comes with ImageMagic)
ghostscript

Best
Martin

[D***@terra.es]

Post by Martin Schröder

Post by D***@terra.es
Do you know of any opensource (command line) program that can convert
pdfs to jpegs (maybe using poppler)?

The next time try Google first.

I tried Google. That is why I am posting here.

Post by Martin Schröder
convert (comes with ImageMagic)

It is painfully slow, gives not the good quality that poppler and cairo
does and I do not know how to make high resolution images.

Post by Martin Schröder
ghostscript

convert uses ghostscript so the quality is as bad.
(poppler+cairo is supposed to give much more quality, right?)

You should send any references to using any of the programs you mention
because I could not find any good docs about using them to output high
resolution jpegs.



Ahora también puedes acceder a tu correo Terra desde el móvil.
Infórmate pinchando aquí.

[Martin Schröder]

Post by D***@terra.es
It is painfully slow, gives not the good quality that poppler and cairo
does and I do not know how to make high resolution images.

poppler is no RIP.

Post by D***@terra.es

Post by Martin Schröder
ghostscript

convert uses ghostscript so the quality is as bad.
(poppler+cairo is supposed to give much more quality, right?)

I doubt it; they are optimized and intended for screen use.

Try
gs -sDEVICE=jpeg -sOutputFile=test.jpg -r1000 -dBATCH -dLastPage=1
-dTextAlphaBits=4 -dGraphicsAlphaBits=4 -dNOPAUSE test.pdf

Best
Martin

[Carl Worth]

Post by D***@terra.es
Do you know of any opensource (command line) program that can convert
pdfs to jpegs (maybe using poppler)?

Here's a tiny little command-line program that Kristian wrote for use
in the cairo test suite, (and I converted it from using GdkPixbuf to
using straight poppler-to-cairo rendering).

It doesn't meet your exact requirements, but it should be fairly
straightforward for someone knowledgeable in C or shell scripting to
adapt it to your needs.

It's a C program that you should be able to compile as follows:

cc $(pkg-config --cflags --libs poppler-glib poppler-cairo) -o pdf2png pdf2png.c

Then, you can run it to produce a PNG image of a single page of a PDF
file as follows, (the final number on the command-line specifies which
page to extract):

./pdf2png input.pdf output.png 1

Then you could convert the output from PNG to jpeg with pnmtools:

pngtopnm < output.png | pnmtojpeg > output.jpg

So perhaps that's helpful,

-Carl