captcha image not rendered

[milc]

After installing the JComments to my joomla server, configuring...
the captcha image was not shown so one could not make a post.

Manually coping the image string to a new browser:
index.php?option=com_jcomments&task=captcha&tmpl=component&ac=45304
the following error shows up:
Fatal error: Call to undefined function imagecreatefrompng() in /...../com_jcomments/libraries/kcaptcha/kcaptcha.php on line 49

To resolve, I had to install the php5-gd module, restart apache2 by
apt-get install php5-gd
/etc/init.d/apache2 restart

on my debian server.

Maybe this could be added to the prerequisites list or the setup checks.

Regards, MilC

[thundercat]

Jepp! Captcha's are text generated into an image, and php requires GD library to do that.