The `Greyscale=BOOL` INI setting and the optional `G` in the `+F`
command-line switch are currently documented (only) in the SDL reference
section for the obsolete `hf_gray_16` global scene setting.
I would suggest moving the documentation of these new-in-v3.7 features
to the file output options reference section, and essentially trim down
the `hf_gray_16` documentation to a reference thence.
(2) Changes to the PGM ("greyscale PPM") format:
Previously, the "greyscale PPM" (technically PGM) output file format
always used linear output. In v3.8, this will be changed to match that
of the regular (non-greyscale) PPM format (i.e. `File_Gamma` will be
honored if specified, otherwise the ITU-R BT.709 gamma transfer function
will be applied).
(3) Changes to the bit depth:
Previously, the bit depth (as specified by either the `n` in `+Fxn` or
by the `Bits_Per_Color` setting) was limited to the range 5..16; in
v3.8, this will be changed to allow values as low as 1.
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