Black level tag returns incorrect values

[nickspiker]

Could be missing something but I'm pretty sure this is a bug.
I'm running Ubuntu and version 12.40 of exiftool
Here's what I get from running exiftool Caseandtarget.dng
Black Level : 40 20 0
but the actual blackpoint is 4,097
and here's a link to the .dng

[Phil Harvey]

Code Select Expand

> exiftool Caseandtarget.dng -subfiletype -blacklevel -G1 -a
[IFD0]          Subfile Type                    : Reduced-resolution image
[SubIFD]        Subfile Type                    : Full-resolution image
[SubIFD1]       Subfile Type                    : Reduced-resolution image
[SubIFD2]       Subfile Type                    : Reduced-resolution image
[SubIFD3]       Subfile Type                    : Reduced-resolution image
[SubIFD]        Black Level                     : 4097 4097 4097
[SubIFD3]       Black Level                     : 40 20 0
There are multiple BlackLevel tags in this file.  I think you are interested in SubIFD:BlackLevel.

- Phil

[wywh]

Use -a to show duplicate tags:

Code Select Expand

exiftool -a -G1 -s Caseandtarget.dng
[...]
[SubIFD]        BlackLevel                      : 4097 4097 4097
[...]
[SubIFD3]       BlackLevel                      : 40 20 0
[...]
- Matti

[nickspiker]

Code Select Expand

> exiftool Caseandtarget.dng -subfiletype -blacklevel -G1 -a
[IFD0]          Subfile Type                    : Reduced-resolution image
[SubIFD]        Subfile Type                    : Full-resolution image
[SubIFD1]       Subfile Type                    : Reduced-resolution image
[SubIFD2]       Subfile Type                    : Reduced-resolution image
[SubIFD3]       Subfile Type                    : Reduced-resolution image
[SubIFD]        Black Level                     : 4097 4097 4097
[SubIFD3]       Black Level                     : 40 20 0
There are multiple BlackLevel tags in this file.  I think you are interested in SubIFD:BlackLevel.

- Phil

Awesome!
Totally makes sense.  Not sure why that didn't occur to me.