I was wondering if there's a little application out there that can edit disk images smoothly. By editing, I mean being able to reduce or increase its size, remove unused space, change its content, etc. by opening the dmg or iso file in question for instance.
I am not necessarily talking about a disk image you create yourself but also an image you get from somewhere else.
If there is no such application, I would appreciate if you could inform me so.
In my mind, a tool like this would make playing around with our disk images much easier.
Instead of extracting the content of an image then creating a new one and then building it, you could:
Open Image file, change its content, its size, save and voil