-define colorspace:auto-grayscale=false does not work.

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$ magick -version
Version: ImageMagick 7.0.7-28 Q16 x86_64 2018-04-17 http://www.imagemagick.org
Copyright: © 1999-2018 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Features: Cipher DPC HDRI Modules OpenMP
Delegates (built-in): bzlib cairo djvu fftw flif fontconfig freetype gslib gvc jbig jng jp2 jpeg lcms lqr ltdl lzma openexr pangocairo png ps raw rsvg tiff webp wmf xml zlib

According to viewtopic.php?t=28453#p126332

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-define colorspace:auto-grayscale=false

should work.

First, create test input image like this:

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$ magick logo: -colorspace Gray tiff:- | magick - -type TrueColor logo.tif      
$ magick identify logo.tif
logo.tif TIFF 640x480 640x480+0+0 8-bit sRGB 52498B 0.000u 0:00.000

Then,

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$ magick logo.tif -define colorspace:auto-grayscale=false result.tif
$ magick identify result.tif
result.tif TIFF 640x480 640x480+0+0 8-bit Grayscale Gray 33432B 0.000u 0:00.000

it looks no effect, however the latter form

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$ magick logo.tif -set colorspace:auto-grayscale false result2.tif
$ magick identify result2.tif
result2.tif TIFF 640x480 640x480+0+0 8-bit sRGB 52498B 0.000u 0:00.000

is working fine for the same input.


PS
same result with the newest version.

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c:\tmp>magick -version
Version: ImageMagick 7.0.8-6 Q16 x64 2018-07-09 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2018 ImageMagick Studio LLC
License: http://www.imagemagick.org/script/license.php
Visual C++: 180040629
Features: Cipher DPC HDRI Modules OpenMP
Delegates (built-in): bzlib cairo flif freetype gslib heic jng jp2 jpeg lcms lqr
 lzma openexr pangocairo png ps raw rsvg tiff webp xml zlib