Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
/opt/local/bin/convert DSC_9087.NEF DSC_9087.jpg
convert: delegate failed `"ufraw-batch" --silent --create-id=also --out-type=png --out-depth=16 "--output=%u.png" "%i"' @ error/delegate.c/InvokeDelegate/1310.
convert: unable to open image `/var/tmp/magick-49712wdmi9chWONiz.ppm': No such file or directory @ error/blob.c/OpenBlob/2709.
convert: no images defined `DSC_9087.jpg' @ error/convert.c/ConvertImageCommand/3210.
I have tried ImageMagick 6.9.0-0 installed with ports and 6.9.1-6 Q16 installed with HomeBrew on a less than 1 week old MacBook Pro running 10.10.4. Both have the same result.
ImageMagick uses the ufraw-batch delegate program to read image files in the NEF format. You will need the ufraw-batch utility in your execution path. If you type 'which ufraw-batch' and it returns 'Command not found', ImageMagick will be unable to read the NEF format.
I don't know the answer, though I see the error message in the first post was "delegate failed", and in the last post was "UnableToOpenBlob". You might try "-verbose" as the first option for possible insight. Then try "-debug all".