I have a Canon Powershot SD 110 camera, which is several years old. Still works fine, but whenever I open an image with the computer and change it, the computer seems to save the image in a format that the camera does not recognize. Is there a program that will revert this image to a format the camera recognizes, and will display?

I have thought a while, but I don't know what to do about it. Would it be a codec?