Cartoon edge width

Support Compositing and Post Processing
1

Hello,

I have searched the forum a bit, but no answer to my question at a glance, I set up Cartoon Edge effect and come up with different renderings onto a 800x600 and 2000x1500 canvas - relative width of the edge is not the same
http://img148.imageshack.us/img148/972/arcadix3dshirt3d2800x60.th.png
http://img826.imageshack.us/img826/5149/arcadix3dshirt3d22000x1.th.png

How would you approach getting the same edge width for differently sized output images?

I used the 2.53-Beta.

Thanks