Great (complex) pictures dont work if they are too big

[Dombi]

Hallo from Germany (reason for bad english),

I use a script to design napkins online (http://www.servietten-deko.de/servietten-bedrucken.php). Allmost all runs fine, but if the pictures are to big (complex) then the system dont work. Can be roundings error the problem?

In this video you see the problem. http://www.servietten-deko.de/videos/too-big-tree.mp4

My system:
PHP 5.2.17
imagick extension: 3.1.2
max imagick version: 6.7.1 (but I can use 4.2.9, 6.2.6 and 6.5.7, too)
I use convert with "-density 300"

I know that this are not many details. Some Ideas to resolve the problem?

Thank you.

PS: Can i anyway show me the errors with the "convert funtions?"

[Dombi]

I found the problem myself. It was no imagick problem.