Hi
I noticed that dispcal sRGB TRC target elevates black brightness, it isn't
native anymore althought it says so:
/--/
Target black brightness = native brightness
Target gamma = sRGB curve
/--/
dispcal -g2.2 -k0 maintains native black brightness
dispcal -gs -k0 has elevated black brightness, I get noticeable ~80:1
less contrast.
Looking at the calibration curves the -g2.2 ones go down to R=G=B=1 and
then have straight section down to 0.
In -gs case the curves end up separately on somewhat higher Y values.