can't read ACR 7.1 HDR dng

[tksharpless]

Version: ImageMagick 6.9.2-6 Q16 x64 2015-11-14
Problem: trying to convert .dng files generated by Lightroom cc HDR merge. E.G. identify gives

F:\Photo\Porch-hdr-26Aug16>identify -verbose DSC01800-HDR.dng
Cannot decode file C:/Users/User/AppData/Local/Temp/magick-5260itke8nH0QyLJ
identify.exe: delegate failed `dcraw.exe -6 -w -O "%u.ppm" "%i"' @ error/delegate.c/InvokeDelegate/1332.
identify.exe: unable to open image `C:/Users/User/AppData/Local/Temp/magick-52607p0KwqjseyMe.ppm': No such file or directory @ error/blob.c/OpenBlob/2701.

BTW another program (PTGui) that uses dcraw also reports it cannot read these files.
Any known workaround?

[snibgo]

Try using dcraw directly, eg:

Code: Select all

dcraw.exe -6 -w DSC01800-HDR.dng

If that doesn't work, then perhaps the dng is corrupt.

[tksharpless]

I think it has to do with the latest version of ACR (7.1) -- exporting from LR with the option of compatibility with an earlier version gives a file that dcraw can read.

[snibgo]

Good stuff. I suggest you raise this with the dcraw people, as they probably want to keep up with LR releases.