Not logged in.  Login/Logout/Register | List snippets | | Create snippet | Upload image | Upload data

15
LINES

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

Lua code - Image transformer

1  
get("#372") -- getContrast

2  


3  
_, _, min, max = getContrast(img)



4  


5  
-- copy image and invert



6  


7  
w, h = img.width, img.height



8  
pixels = {}



9  
for y = 0, h-1 do



10  
  for x = 0, w-1 do



11  
    b = bright(rgb(img.getInt(x, y)))



12  
    n = math.max(0, math.min(255, math.floor((b-min)/(max-min)*255+0.5)))



13  
    pixels[y*w+x+1] = n*0x010101



14  
  end



15  
end




      
test run  test run with input  download  show line numbers   
Travelled to 12 computer(s): aoiabmzegqzx, bhatertpkbcr, cbybwowwnfue, gwrvuhgaqvyk, ishqpsrjomds, lpdgvwnxivlt, mqqgnosmbjvj, pyentgdyhuwx, pzhvpgtvlbxg, tslmcundralx, tvejysmllsmz, vouqrxazstgt


No comments. add comment
      
      
  

  

    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:
    758 / 192
  

      

    Referenced in:
[show references]