document.write('
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  1. function setBlack(pixel){
  2.     pixel.setRed(0);
  3.     pixel.setGreen(0);
  4.     pixel.setBlue(0);
  5.     //return pixel;
  6. }
  7.  
  8. function pixelOnEdgeDifferentThicknesses(pixel, image, horizontalBorderWidth,  verticalBorderWidth){
  9.     if(pixelOnHorizontalEdge(pixel, image, horizontalBorderWidth)){
  10.         return true;
  11.     }
  12.     if( pixelOnVerticalEdge(pixel, image, verticalBorderWidth) ){
  13.         return true;
  14.     }
  15.     return false;
  16. }
  17.  
  18. function pixelOnVerticalEdge(pixel, image, vbw){
  19.     y = pixel.getY();
  20.     if(y <= vbw){
  21.         return true;
  22.     }
  23.     var height = image.getHeight();
  24.     if(y >= height - vbw){
  25.         return true;
  26.     }
  27.     return false;
  28. }
  29.  
  30. function pixelOnHorizontalEdge(pixel, image, hbw){
  31.     x = pixel.getX();
  32.     if(x <= hbw){
  33.         return true;
  34.     }
  35.     var width = image.getWidth();
  36.     if(x >= width - hbw){
  37.         return true;
  38.     }
  39.     return false;
  40. }
  41.  
  42. var image = new SimpleImage("duvall.jpg");
  43. var horizontalBorder = 5;
  44. var verticalBorder = 15;
  45. for(var pix of image.values()){
  46.     if( pixelOnEdgeDifferentThicknesses(pix, image, horizontalBorder,  verticalBorder) ){
  47.         setBlack(pix);
  48.     }
  49. }
  50. print(image);
');