#@gui Gradient norm [JR's mod] : fx_jr_gradient_norm, fx_jr_gradient_norm_preview(1)
#@gui : Smoothness = float(0,0,10)
#@gui : Contrast = float(0.45,0,1.5)
#@gui : Min threshold = float(40,0,100)
#@gui : Max threshold = float(60,0,100)
#@gui : Negative = bool(0)
#@gui : Include direction = bool(0)
#@gui : Scale X = float(1,0,5)
#@gui : Scale Y = float(1,0,5)
#@gui : Interpolation = choice(2,"Nearest","Average","Bilinear","Bicubic")
#@gui : Alpha = bool(0)
#@gui : sep = separator(), Preview type = choice("Full","Forward horizontal","Forward vertical","Backward horizontal","Backward vertical","Duplicate top","Duplicate left","Duplicate bottom","Duplicate right","Duplicate horizontal","Duplicate vertical","Checkered","Checkered inverse"), Preview split = point(50,50,0,0,200,200,200,0,10,0)
#@gui : sep = separator(), note = note("<small>Author: <i><a href="http://ow.ly/wpsV30fzhdI">David Tschumperl&#233;</a></i>.      Latest update: <i>2010/29/12</i>.</small>")

jr_dir2rgb :
v - channels 0,1 repeat $! l[$>] nm={0,n}
s c complex2polar round.. 0.001
*. {180/pi} %. 360 100%,100%,1,1,1 mv... $!
c 0,360 if {im!=iM} n. 0,1 else f. 1  fi
a c hsv2rgb
nm $nm endl done v +

jr_gradient_norm :
b $1 gradient_norm c 0,255 ^ $2
c $3%,$4%
if $5 negate fi
n 0,255

fx_jr_gradient_norm :
repeat $! l[$>]
if {$9==3}
inter=5
else
inter={1+$9}
fi
if {$7!=1||$8!=1}
ww={w}
hh={h}
shift -0.5,-0.5,0,0,1
r {max(1,$7*w)},{max(1,$8*h)},100%,100%,$inter
fi
if $6
+l luminance gradient append c
blur $1 orientation +jr_dir2rgb
endl rm[1]
if $5
l[1]
rgb2hsv8 100%,100%,1,1 f[1] "j(#0,0,0,0,2)" f[0] "[i0,i1,255]" hsv82rgb[0]  a c
fx_solidify_td 100,0,10,2,0
rgb2hsv8 f "[i0,i1,255]" hsv82rgb
endl
fi
fi
jr_gradient_norm[0] ${1-5}
if {$7!=1||$8!=1}
r $ww,$hh,100%,100%,$inter
fi
if $6 blend multiply fi
if $10 rgb2hsv8 100%,100%,1,1 f[1] "j(#0,0,0,0,2)" f[0] "[i0,i1,255]" hsv82rgb[0] a c fi
endl done
fx_jr_gradient_norm_preview :
fx_jr_gradient_norm $*
#gui_split_preview "fx_jr_gradient_norm $*",${-3--1}