#@gui Hessian Blend: fx_hessian_blend, fx_hessian_blend_preview(1)
#@gui : Norm 1 = float (0,-5,5)
#@gui : Norm 2 = float (1,-5,5)
#@gui : Merging option = choice(27,"add","alpha","and","average","blue","burn","darken",
#@gui : "difference","divide","dodge","exclusion","freeze",
#@gui : "grainextract","grainmerge","green","hardlight","hardmix",
#@gui : "hue","interpolation","lighten","lightness","linearburn",
#@gui : "linearlight","luminance","multiply","negation","or",
#@gui : "overlay","pinlight","red","reflect","saturation","screen",
#@gui : "shapeaverage","softburn","softdodge","softlight","stamp",
#@gui : "subtract","value","vividlight","xor")
#@gui : Opacity = float (1,0,1)
#@gui : Reverse Order = bool(0)
fx_hessian_blend :
-m "MergeChoise : $""=_mode" -MergeChoise "add","alpha","and","average","blue","burn","darken","difference","divide","dodge","exclusion","freeze","grainextract","grainmerge","green","hardlight","hardmix","hue","interpolation","lighten","lightness","linearburn","linearlight","luminance","multiply","negation","or","overlay","pinlight","red","reflect","saturation","screen","shapeaverage","softburn","softdodge","softlight","stamp","subtract","value","vividlight","xor","edges","error"
MergingOption=$3
Opacity=$4
ReverseOrder={!$5}
+l otsu , af_hnorm n $1,$2 endl +* blend ${_mode{$MergingOption+1}},$Opacity,$ReverseOrder
fx_hessian_blend_preview :
repeat {max(0,l)}
fx_hessian_blend[$>] $*
done