error: imread: invalid image file: Magick++ exception --with-quantum-depth=16

[龙永彪]

Hello, I'm using Ubuntu 11.10 on a i686 machine. The version of
Octave in software center is still 3.2.4. So I decide to compile it
from source. I got some warning and errors when run the 'imread`
command:
    warning: your version of GraphicsMagick limits images to 16
                 bits per pixel
    error: imread: invalid image file: Magick++ exception: Magick
            No decode delegate for this image format () reported by
            magick/constitute.c:8279  (ReadImage)
    error: called from:
    error:   /home/longyb/temp/octave-3.6.1/scripts/image/imread.m
            at line 74, column 7

This is what I did from the very begining:

1. Download ftp://ftp.gnu.org/gnu/octave/octave-3.6.1.tar.gz
2. run sudo apt-get install build-dep octave3.2
3. Unpack octave-3.6.1.tar.gz, change to octave-3.6.1 directory.
4. run ./configure --prefix=/home/longyb/octave-3.6.1, then make
5. ./run-octave
6. in octave prompt, run the example code
         I = imread ("myimage.jpg");
    I got a warning, your version of GraphicsMagick limits images
    to 8 bits per pixel

7. After googling, I know it's a bug. see [1]
   The cause is that graphicsmagick didn't build with
   --with-quantum-depth=16,
8. So I decide to rebuild graphicsmagick myself.
9. I follow the instructions in [2] to rebuild graphicsmagick. Briefly,
       sudo apt-get install build-essential fakeroot
       sudo apt-get build-dep libgraphicsmagick++3
       cp graphicsmagick-1.3.12 to-some-dir
       cd $to-some-dir/graphicsmagick-1.3.12
       vi ./debian/rules, add '--with-quantum-depth=16 \' after
             the line that says --enable-libtool-verbose \”
       debuild -i -us -uc -b
       cd $to-some-dir/
       sudo dpkg --install
libgraphicsmagick++3_1.3.12-1build1_i386.deb
libgraphicsmagick1-dev_1.3.12-1build1_i386.deb
       sudo dpkg --install
libgraphicsmagick++1-dev_1.3.12-1build1_i386.deb
libgraphicsmagick1-dev_1.3.12-1build1_i386.deb
10. re-configure and re-make octave, then ./run-octave
11. in octave prompt, run the example code
         I = imread ("myimage.jpg");
     I got
         warning: your version of GraphicsMagick limits images to 16
                      bits per pixel
         error: imread: invalid image file: Magick++ exception: Magick:
                 No decode delegate for this image format () reported by
                 magick/constitute.c:8279  (ReadImage)
         error: called from:
         error:   /home/longyb/temp/octave-3.6.1/scripts/image/imread.m
                  at line 74, column 7

I googled it and found no useful information. I don't know what cause
the problem. I need help, any suggestions are greatly appreciated!

[1] http://savannah.gnu.org/bugs/index.php?30715
[2] 
http://jethomson.wordpress.com/2010/08/22/enable-octave-to-read-16-bit-images/

--
Best Regards