Imagemagick linear invert as in Gimp?
I'd like to LINEAR invert image in Imagemagick with the same output as in Gimp.
Original image:
Gimp invert:
Gimp LINEAR invert:
Imagemagick "negate" function:
Which function should I use then? In Imagemagick documentation I didn't found "linear invert".
Solution
What is your Imagemagick version and platform? When I do the following on IM 6.9.13.3 on Mac OSX Ventura, I get
convert map.jpg -negate x.jpg
That looks like a proper invert for the input and seems to match GIMP result.
compare -metric rmse x.jpg GIMP.jpg null:
135.592 (0.00206901)
The comparison shows only a 0.2% difference between the IM result and the GIMP result.
ADDITION
From the GIMP docs, the inversion is done in linear colorspace. So in Imagemagick,
convert map.jpg -colorspace rgb -negate -colorspace sRGB map_linear_invert.jpg
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