As a visually impaired poker player I usually made some modifications to the graphics of sites that I play on. However on one site (ipoker) when I try to open the graphics files I get an error message from photoshop."unknown or invalid jpeg marker" I downloaded something called xnView but it was unable to open the files. I would be very grateful if someone could tell me how to open the files and then return them to the format they are in once I have altered them.
I know this is possible because there is software available for modifying some of the graphics on the site, unfortunately not the ones I need.