Can't write Bayer Green Split tag, is it possible?

[paulinventome]

Hi,

I have some cDNGs here with odd looking values in the Bayer Green Split tag but i am unable to update the value, i'm using

exiftool -BayerGreenSplit=0 test.dng

I've managed to update Camera Serial Number by doing the same kind of thing exiftool -CameraSerialNumber=test test.dng and that did update.

So perhaps this tag cannot be updated?

thanks
Paul

[Phil Harvey]

Hi Paul,

If you check the EXIF tag name documentation, you will see that BayerGreenSplit is writable, but the default write location is SubIFD.  So the tag will only be written if the SubIFD exists (because ExifTool will not create a new SubIFD).  Use the -G1 option when extracting to see where it is in your image, and write to the same location.

- Phil

[paulinventome]

Thanks Phil,

I've only just started using exiftool for forgive me ignorance

The -G1 options shows the BayerGreenSplit as

[IFD0] BayerGreenSplit : 5000

along with lots of other tags with the same IFD0

Does that help? What would i need to do to update some of these tags?

thanks
Paul

[Phil Harvey]

Hi Paul,

The command would look like this then:

exiftool -ifd0:bayergreensplit=0 test.dng

- Phil