I am in a camera club which has a lot of members that use point and shoot cameras, a lot of these cams do not shoot in raw and we are finding that the members do not understand about jpegs and how they lose data when being edited and cropped.
I would like some advice on what might be a good format to resave the file that is losless but wont blow the file up beyond its capability of printing a decent A4 image. They are cropping their shot then blowing them up to A4 and they look almost pixelated and very soft, no sharpness at all, and otherwise good images are being ruined, can they only ever be printed to 5 x7 or is it possible to get them to A4.