problems writing binary data to an existing tag

[alex9000]

Hello,
I've been using exiftool to work with the depth maps in portrait mode images.  Getting the depth maps out is easy and well documented.  Now, I'm working on an application where I modify the depth map and overwrite the original image.

I'm working with iOS portrait mode photos, so the depth map is in the -MPImage2 tag

when I run:

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  exiftool -s test-lumen.jpg
I get:

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MPImage2                        : (Binary data 36947 bytes, use -b option to extract)

And I can extract the data easily using:

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exiftool -b -MPImage2 test-lumen.jpg > depthMap.jpg

I'm having trouble when I try to write a modified depth map back into the tag.

I've been doing:

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exiftool '-MPImage2<=new-depth.jpg' test-lumen.jpg 
but I get back

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Warning: Tag 'MPImage2' is not defined
Nothing to do.

I feel like I'm missing an option to specify that I'm writing a binary file.  I haven't found an example of writing a binary file into a tag, so I'm just going with the regular 'write tag data from a file' example, just like I would if I were writing a thumbnail image.  I'm not sure why it's saying the tag isn't defined, though.  Do I need to do anything different when it comes to binary data?  Is there some issue with tag write permissions?  I'm attaching the file I'm working with, for reference.  I'm a little lost in the dark here, and I'd appreciate any help. 

[StarGeek]

If you check the MPF tag page, you'll see that exiftool doesn't write any of those tags.

[alex9000]

Got it, thanks

Alex