imagemagick library path not found

I use I,agemagick because it gives much clearer images as does the GD2 library

First I copied the image.imagemagick.inc into the includes directory as in D5
Then enabled the image-magick toolkit in http://drupal/admin/settings/image-toolkit (local site)

I get a red box around my convert path ( /usr/bin/convert )
along with the errormessages:

    * The specified ImageMagic path does not exist.
    * JPEG quality must be a number between 0 and 100.

so here is my directory listing of /usr/bin:

wiert@conifera /usr/bin# ls -l convert
-rwxr-xr-x 1 root root 7056 Oct  3 00:45 convert
wiert@conifera /usr/bin# ls -l convert
-rwxr-xr-x 1 root root 7056 Oct  3 00:45 convert

seems ok and was working in D5