645 PRO—pro-quality output, for the first time
645 PRO is the first and only iPhone camera app to give you lossless “developed RAW”—dRAW—TIFF files*, a workflow essential for many professionals. Its HI-quality JPEGs, too, are of a quality typically associated with higher-end digital cameras, with the option to save MAX-quality JPEGs with no visible compression artifacts at all.
There is a great PDF manual supplied with the app, as well as many online resources where you can read about it. Good starting point is the creator’s website: 645PRO for iPhone. Yo can buy the application in iTunes store, for $2.99, get it now: 645 PRO