Making things DRY. Some feedback please.

[eluser]Référencement Google[/eluser]
I personally do all image manipulation in a library. To give more precision to my answer, I extend the CI Image manipulation library in a MY_Image.php file.

I can understand the point of doing that in a model, but for keeping my code clean I prefer not to explode parts of the code everywhere and I prefer to keep some grouping of related things.