Have just been sent a photo, and on the attachment it says it is JPG. I put it in the 'paint' editor to rotate it through 90 degrees and that works alright. But it also needs to be lightened, so I sent it to my laptop that has windows live photo gallery, which has the facility to lighten it. But when in that program, it tells me it cannot process it because it is a 'read only' file. Grateful for advice on what i might most simply do to lighten it please.