How to determine if a DNG has the original CR2 RAW embedded?

[lingfish]

Hi all,

I think I know the answer to this, but just need to be quite sure.

I want to know how to 100% confirm if DNG's that I have, have the original CR2 Canon RAW embedded in them?

I'm pretty sure I've always done this when converting to DNG, but want to be absolutely sure before I delete my CR2's forever.

I'll obviously need to do this in a scripted fashion.

Is the presence of the following good enough, or am I missing some better way to detect this?

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Original Raw File Name          : IMG_0013.CR2
Original Raw Image              : (Binary data 30406314 bytes, use -b option to extract)

Thanks!

[Phil Harvey]

This definitely indicates that some data is stored for the RAW image.  To be sure that the exact image is stored, I would try something like this:

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exiftool -originalrawimage -b FILE.dng > out.cr2
diff out.cr2 original.cr2


I would feel much better to know that the image was stored properly and that I could retrieve it if I wanted.  Just running a test like this on a few images would let me sleep better at night.

- Phil

[lingfish]

Thanks heaps for the Phil, and your awesome tool.

I may even just md5sum or similiar to what you've suggested.

I just needed to know for sure if that was the meta/header stuff I was to look for if the embed existed at all or not.