JpegDigger
JpegDigger is a simple freeware utility to extract JPEG files from corrupt RAW files. Currently supports .NEF, .CR2, .CRW, .ORF, .ARW, .SRW, .PEF, .DNG, .3FR, .RAF and...
JPEGsnoop is a detailed JPEG image decoder and analysis tool. It reports all image metadata and can even help identify if an image has been edited.
every digital photo contains a wealth of hidden information jpegsnoop was written to expose these details to those who are curious.
not only can one determine the various settings that were used in the digital camera in taking the photo (exif metadata, iptc), but one can also extract information that indicates the quality and nature of the jpeg image compression used by the camera in saving the file. each digical cameras specifies a compression quality levels, many of them wildly different, leading to the fact that some cameras produce far better jpeg images than others.
forensics exif jpeg decoding image-authentication