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< > BotCompany Repo | #373 // Maximize Contrast (also convert to black/white)

Lua code - Image transformer

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get("#372") -- getContrast

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_, _, min, max = getContrast(img)



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-- copy image and invert



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w, h = img.width, img.height



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pixels = {}



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for y = 0, h-1 do



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  for x = 0, w-1 do



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    b = bright(rgb(img.getInt(x, y)))



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    n = math.max(0, math.min(255, math.floor((b-min)/(max-min)*255+0.5)))



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    pixels[y*w+x+1] = n*0x010101



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  end



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end




      
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    Snippet ID:
    #373
  

  

    Snippet name:
    Maximize Contrast (also convert to black/white)
  

    

    Eternal ID of this version:
    #373/1
  

  

    Text MD5:
    ddddde999a932b220c6c3c25fe656026
  

    

    Author:
    stefan
  

  

    Category:
    image transformers
  

  

    Type:
    Lua code - Image transformer
  

        

    Public (visible to everyone):
    Yes
  

  

    Archived (hidden from active list):
    No
  

  

    Created/modified:
      2015-02-03 21:27:24
  

  

    Source code size:
    338 bytes / 15 lines
  

  

    Pitched / IR pitched:
    No / Yes
  

    

    Views / Downloads:
    741 / 187
  

      

    Referenced in:
[show references]