G'MIC exercises

Software G'MIC
73

I have been maintaining a user.gmic and adding all sorts of wackiness, though most of it is just for convenience and edge cases.

@garagecoder has told me to be more confident and @Brian_Innes expressed interest in my sample image here, so I thought it might be a good idea to share it in this thread to get feedback before I make it official. It is a riff off of the gradient_norm. However, I don’t know if it is proper to call it a Hessian norm.

#@gui Hessian norm : fx_hnorm, fx_hnorm_preview(0)
#@gui : Strength = float(1,.5,1.5)
#@gui : Contrast = int(50,1,99)
#@gui : Invert = bool(0)
#@gui : sep = separator(), note = note("Filter by <i><a href="https://discuss.pixls.us/u/afre">afre</a></i>. Latest update: <i>2018-05-09</i>.")
fx_hnorm :
  af_hnorm ^ $1
  c 0,$2%
  if $3 negate fi
  n 0,255

af_hnorm:
  repeat $! l[$>]
    +hessian[0] xx +hessian[0] xy +hessian[0] xz +hessian[0] yy +hessian[0] yz hessian[0] zz
    sqr + s c + sqrt
  endl done

fx_hnorm_preview :
  fx_hnorm $*
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