Mac users interested in Imageverifier by marc rochkind generally download:
ImageVerifier - The most powerful and easy-to-use image verifier.
Verify active or archived images structurally (JPEG, raw, DNG, PSD, TIFF) and by stored 512-bit hash. Ensures that backups are correct and that archives are still valid. Stores results in a built-in database. Goes inside image formats and decompresses to determine integrity of image. Takes advantage of multiple CPUs/cores.
