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- -- picture to grayscale - from Paulo Silva, july 2012 - gpl licence
- w,h=getpicturesize()
- function grayscaleindexed(c)
- r,g,b=getcolor(c);return math.floor((b*11+r*30+g*59)/100);end
- for y=0,h-1,1 do
- for x=0,w-1,1 do
- u=getpicturepixel(x,y)
- k=grayscaleindexed(u)
- putpicturepixel(x,y,k)
- end;end
- for c=0,255,1 do setcolor(c,c,c,c);end
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