Das Werkstatt

Posted: **Fri Dec 11, 2009 11:30 pm**

I've discovered a strange oddity (or bug?) in the ImageMagic v6.3.7 available in Ubuntu Hardy with lossless JPEG 2000 conversion: It ain't lossless, because *some* bytes are reduced by the 1 (e.g. 8B => 8A).

I'm currently evaluating if it's a bug and if it's still an issue in v6.5.8-4 (Dec 2009).

In order to compile ImageMagick with JPEG 2000 support, I've had to install the following packages:

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sudo apt-get install libjasper-dev libjpeg62 libperl-dev

Download the ImageMagic source, unpack it and tell the "configure" script to put it in an optional directory, so it won't collide with the already installed, older version - then compile it by running "make":

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./configure --prefix=/opt/imagemagick --with-jp2
make

(JP2 support should be turned on by default, but I've added "--with-jp2" just to be sure)

If JPEG and JPEG-2000 support is properly enabled, the output of ./configure should contain these lines:

JPEG v1 --with-jpeg=yes yes
JPEG-2000 --with-jp2=yes yes

If something went wrong, these formats will be disabled and look like this:

JPEG v1 --with-jpeg=yes no
JPEG-2000 --with-jp2=yes no

Without the libjasper-dev and libjpeg62 package, they're both "no" - regardless if you switch support for them on or not.

Installing it seemed a bit strange, because you can't just install with "checkinstall" as root in one step. I've created the target folder as a regular user and then ran "make install" twice:

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mkdir /opt/imagemagick
sudo chown myuser:myuser /opt/imagemagick
make install
sudo checkinstall make install

Now you should have an independent version of ImageMagick installed in /opt/imagemagick.

Das Werkstatt

Compile ImageMagick with JPEG2000 support

Compile ImageMagick with JPEG2000 support