convert huge pdf to jpeg -> ultraslow performacne

[stephan0h]

Hi,
I'm using imagemagick's convert-command for converting pdf-files to jpeg.

My machine runs on linux, it has 4GB RAM and a core dual processor.

Now I've got a quite big pdf which I want to convert: 180*180 cm with 300 dpi. I want to convert this to a jpeg file of approximately 20000*20000 pixels. I admit this is huge.

I let the convert statement run for 8 hours and then I hit <ctrl>+c. The cpu was nearly idle and the hard disk was working like hell. So apparently I crossed the limits of imagemagick?

Any ideas of what I can do?

thanks,
stephan

[fmw42]

perhaps see http://www.imagemagick.org/Usage/files/#massive as you may be running out out memory

[magick]

Try converting the first page:

• convert 'image.pdf[0]' image.jpg

[stephan0h]

Try converting the first page:

• convert 'image.pdf[0]' image.jpg

Thanks for the hint - but this pdf consists only of one page

[stephan0h]

perhaps see http://www.imagemagick.org/Usage/files/#massive as you may be running out out memory

Thanks for pointing me there. I was now successful using:

Code: Select all

convert -limit area 8192 -limit memory 8192 -density 300 khm6.pdf khm6.jpg

It finished in less than 10 minutes! Great!

I also tried the stream-command like:

Code: Select all

stream -density 300 khm6.pdf khm6.jpg

This also worked fast - but the resulting files where not readable. Why is that?

thanks,
stephan

[anthony]

I also tried the stream-command like:

Code: Select all

stream -density 300 khm6.pdf khm6.jpg

This also worked fast - but the resulting files where not readable. Why is that?

Stream only outputs raw RGB data. You need to pipe that into a convert command with the right size information to convert back to a more normal image file format.

Stream is typically used to extract a portion (crop) of the input image which is then processed.

[stephan0h]

thanks for clearifying!
regards,
stephan