How to take High Res photos ?

I’d like to use the device webcam to take photos at a resolution higher than the screen resolution.
Obviously the phone can do this - but does anybody know how via unity?

EDIT:
To be clearer - what i meant was to get at the photo resolution - so for example on my iPhone4 i can get at the 1280x720 video resolution via webCamTexture but not at the (approx)2600x2000 resolution of a photo…

thanks

You can pass a required width and height to the web cam texture and ask for larger images than the screen that way.