Rendering program

[grosolan]

Hey ppl sry for almost never posting for a long time but i asure u my mind was here.
I am looking for a rendering program for pictures mostly just to make them sharper.
Example like when u resize an image and make it a lot bigger u can see the pixels expanded.
so any ideas please post away>10x

[grosolan]

Sry for the double post but before u say that it doesnt involve comics i tell u it does because i'm using it to make a large scale comic book-its a progect

[Cardinal]

Photoshop or paintshop pro