Just curious, can you replicate this when you open your slide DNG that is now touched by ACR/LR with Input|Scan from file in VS, can you save out a full res tagged TIFF from VS?
Hi Jaap,
I just did some testing, on a Windows platform, and a different scanner, etc., but anyway.
When I read a DNG Raw negative file from VueScan Pro (9.0.21) (only opened with ACR, not saved) with VueScan again, Task=Scan to File, Source=File, Scan resolution=Custom,
I need to manually increase the Scan dpi to its maximum (the scan resolution that was used). Then on the Crop tab, I set the Crop size=Maximum. That allows me to Scan the 'Raw negative' to TIFF. I only miss 2 and 4 pixels at the edges, but can recreate almost the full original scan size in TIFF negative or rendered TIFF output format.
There are many variables, I know, so it might be different with a different file and OS, but do check the Custom Scan dpi setting.
Hope you can solve it.
I've looked at the altered DNG (it still escapes me why a file has to be altered upon opening, not saving) with a Hex editor comparison, and can pinpoint the changed, and added, bytes between files. However, besides a bit of readable XMP data added at the end of the file, there are also other changed bytes. Some are changed from null to something else, but there are also other changed bytes. Too hazardous to change without knowing the effects.
Cheers,
Bart