How to create synthetic RAW image?

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I copy-pasted straight from RawPedia. Using RT5.1 without any custom tweaks - vanilla camconst.json.

morgan@sabayon /tmp $ convert -version
Version: ImageMagick 6.9.8-6 Q16 x86_64 2017-05-31 http://www.imagemagick.org
Copyright: © 1999-2017 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Features: Cipher DPC Modules OpenMP 
Delegates (built-in): bzlib cairo fftw freetype jng jpeg lcms ltdl openexr pangocairo png rsvg tiff wmf x xml zlib
morgan@sabayon /tmp $ convert hald:12 -depth 16 -colorspace RGB -gravity NorthWest -splice 4x4 -gravity SouthEast -splice 4x4 foo.tif
morgan@sabayon /tmp $ exiftool -DNGVersion=1.4.0.0 -PhotometricInterpretation='Linear Raw' foo.tif
    1 image files updated
morgan@sabayon /tmp $ mv -v foo.tif Hald_CLUT_Identity_12.dng
'foo.tif' -> 'Hald_CLUT_Identity_12.dng'
morgan@sabayon /tmp $ ~/rt_5.1/rawtherapee
  1. Why does your RawTherapee look the way it does? Since that is not a look we support, it indicates you’ve been changing things yourself - perhaps you changed more than just the look?
  2. Have you edited your camconst.json file?
  3. Are you using a Q16 version of ImageMagick? “convert -version” to find out.
  4. Your histogram looks different/incorrect. Apply the “(Neutral)” profile - does it look correct now?
  5. Upload your DNG file. Here’s mine: https://filebin.net/lnwe1um8wkgli7gy/Hald_CLUT_Identity_12.dng