can't edit imported graphic

[guy.cruls]

I can move and resize imported graphics but I can't modify them, for example paint over them, even after I have saved the document.

Pro answers only, please.

Many thanks

[Ton Frederiks · Accepted solution]

It is an image, to edit images you will need an application like Photoshop.

In Illustrator you can add vector elements on top of the image or apply some filters, but editing is limited.