On a website (1) I found the idea that a TIF file can be converted to a
DNG file just by adding some tags and renaming it. Let's test it. Make a
16-bit TIF file:
ffmpeg -f lavfi -i nullsrc=s=320x320,format=yuv444p10le -vf
geq=lum='X/W*32+32*floor(Y/H*32)':cr=512:cb=512,format=rgb48be -frames 1
-y test16.tif
Add some tags:
exiftool -DNGVersion="1.4.0.0" -PhotometricInterpretation="Linear Raw"
test16.tif
Rename the file to DNG:
copy test16.tif test16.dng
The DNG file can be opened with FFmpeg without any problems. But all
other programs complain that the file is corrupt. I tested with
IrfanView, FastStone, Gimp and Fitswork.
What else might be required to make it a valid DNG file?
Michael
(1)
https://rawpedia.rawtherapee.com/Film_Simulation#Advanced_-_Identity_DNG
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