hist_percentile
Arguments:
- _nth[%],_zero={0|1},_min0,_stepw
Description:
Estimation of _nth percentiles (lower & upper) from histogram and returning value(s) in status (${})
_zero Class 0 is zeroed if !=0
_min0 value of class 0
_stepw value of class width (bin size)
Default values:
nth=25%, _zero=0, _min0=0, _stepw=1
Example of use:
$ gmic sp tiger luminance +dh ,,256,0,255 histogram.. 256,0,255 hist_percentile.. , rm.. t=${} to_rgb text $t,40,5,23,1,255,0,0

Command: sp tiger luminance +dh ,,256,0,255 histogram.. 256,0,255 hist_percentile.. , rm.. t=${} to_rgb text $t,40,5,23,1,255,0,0