These tools are fine for personal use - but not easily adapted to corporate use e.g. PCI DSS. Mandatory requirements for PCI DSS include key management under dual control and split knowledge.
As such, commercial tools still rule in the storage encryption space.
And I'm no programmer, so I can't resolve these shortcomings.
lyalc

So, this means ant in an encrypted volume, where the directory and node structure are not visible, you need to 1) identify where an encrypted image is, and apply this comparison algorithm to the EXACT same unencrypted image, to see if it's there.

In other words, the best that this can really do is prove is an image is is in the encrypted volume, by applying the comparison algorithm every 512/4096 bytes along the volume's byte array.

Good for providing a law enforcement case, not much for detecting evidence of a crime - unless you are stupid enough to leave the images around as unencrypted versions as as well as encrypted.

lyalc