Convert CMYK PDF to JPG creates corrupt image.

[atw]

Hi guys,

I am trying to convert PDFs to JPGs on a LAMP (Linux, Apache, MySQL, PHP) server using this command:

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exec("convert test.pdf[0] -density 100 -sample 200x200 test.jpg");

This works brilliantly, most of the time. However, sometimes the results are less than desirable:

Should look like this:


The only difference between the results you see above is that I exported the first as High Quality Print and Press Quality from InDesign CS3 and the second one is exported as Smallest File Size from the same InDesign.

Obviously, they are of different file sizes but that doesn't seem to be the cause.

I believe it is caused by the first two being CMYK and the working one being RGB.

I do not know which version of ImageMagick is installed (or how to find out).

Please help.

---

Versions:

I have figured out how to determine the versions...

ImageMagick Convert ("convert -version"):

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ImageMagick 6.2.8 04/17/08 Q16 file:/usr/share/ImageMagick-6.2.8/doc/index.html Copyright: Copyright (C) 1999-2006 ImageMagick Studio LLC

GhostScript ("gs -h"):

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ESP Ghostscript 8.15.2 (2006-04-19)
Copyright (C) 2004 artofcode LLC, Benicia, CA.  All rights reserved.

[snibgo]

You might install a versions that are less than four year old, and see if you still have the problem.

[atw]

You might install a versions that are less than four year old, and see if you still have the problem.

lol

I am in the process of trying to get the hosting company to update/upgrade the software

But they are SO SLOW

[fmw42]

try

exec("convert -colorspace rgb test.pdf[0] -density 100 -sample 200x200 test.jpg");

[atw]

try

exec("convert -colorspace rgb test.pdf[0] -density 100 -sample 200x200 test.jpg");

Sorry fmw42, unfortunately your suggestion didn't fix the problem. Thank you for the suggestion though...

[fmw42]

suggest you post one of your images that causes problems so someone can see if it is corrupt in some way or test on a different IM.

[atw]

Hi,

I have spoken to the hosting providers and the installed versions are the current versions from the Linux distro's repositories

I have asked them to install from source or use the RPMs shown on this site but I suspect that they will refuse.

Is there an alternative which does not require installation (Java based maybe)?

[atw]

suggest you post one of your images that causes problems so someone can see if it is corrupt in some way or test on a different IM.

Sorry, newbie question alert. How would I attach a PDF to this board?

[snibgo]

Put it on a website somewhere and post the URL here.

[atw]

No need.

I just finished creatine a VMware VM of Ubuntu 9.10 Server with LAMP, SSH, Samba and ImageMagick (the current version) and quess what; yep, it worked perfectly with the exact same PDF (the colour was a little off--suggesting that the PDF is, indeed CMYK).

This leaves me in the rather unfortunate situation that I cannot get the new version installed on the hosting package.

Is there an alternative way to proceed (maybe something similar to ImageMagick/GhostScript but Java based)? Or perhaps a good reputable RPM repository which host the appropriate RPMs for CentOS 5 64-bit...?

Any suggestions gratefully recieved...

Many thanks.

[LooInSpain]

I'm using the same version of IM and Ghostscript on a shared server and was having the same problem. I managed to get around this with this command in IM:

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exec("convert -colorspace rgb -units PixelsPerInch -density 150x150 pdf/Serie-Irta.pdf  pdf/Serie-Irta.jpg");

Now instead of the jpg output like you showed in the first post, the pdf's convert pretty well. Not as good quality as with a later version of IM, but at least they are now converting.