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Editorial Team
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Asked: 2026-05-13T17:32:34+00:00

Trying to blur a picture in Jython. What I have does run but does

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Trying to blur a picture in Jython. What I have does run but does not return a blurred picture. I’m kinda at a loss of what is wrong with it.

FINAL (WORKING) CODE EDITED IN BELOW. THANKS FOR HELP GUYS!

def main(): 

pic= makePicture( pickAFile() )
show( pic )
blurAmount=10
makeBlurredPicture(pic,blurAmount)
show(makeBlurredPicture(pic,blurAmount))

def makeBlurredPicture(pic,blurAmount):

w=getWidth(pic)
h=getHeight(pic)
blurPic= makeEmptyPicture( w-blurAmount, h )
for px in getPixels(blurPic):
  x=getX(px)
  y=getY(px)
  if (x+blurAmount<w):
     rTotal=0
     gTotal=0
     bTotal=0
     for i in range(0,blurAmount):
         origpx=getPixel(pic,x+i,y)
         rTotal=rTotal+getRed(origpx)
         gTotal=gTotal+getGreen(origpx)
         bTotal=bTotal+getBlue(origpx)
     rAverage=(rTotal/blurAmount)
     gAverage=(gTotal/blurAmount)
     bAverage=(bTotal/blurAmount)

     setRed(px,rAverage)
     setGreen(px,gAverage)
     setBlue(px,bAverage)
return blurPic

The pseudo-code was as such : makeBlurredPicture(picture, blur_amount)
get width and height of picture and make an empty picture with the dimensions
(w-blur_amount, h ) call this blurPic

for loop, looping through all the pixels (in blurPic)
    get and save x and y locations of the pixel
     #make sure you are not too close to edge (x+blur) is less than width 
            Intialize rTotal, gTotal, and bTotal to 0
             # add up the rgb values for all the pixels in the blur
             For loop that loops (blur_amount) times
                    rTotal= rTotal +the red pixel amount of the picture (input argument)               at the location  (x+loop number,y)     then same for green and blue
             find the average of red,green, blue values, this is just  rTotal/blur_amount (same for green, and blue)
             set the red value of blurPic pixel to the redAverage  (same for green and    blue)
return blurPic
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1 Answer

  1. Editorial Team

    The problem is that you are overwriting the variable px from the outer loop which is the pixel in the blurred image with a pixel value from the original image.
    So just replace your inner loop with:

    for i in range(0,blurAmount):
    origPx=getPixel(pic,x+i,y)
    rTotal=rTotal+getRed(origPx)
    gTotal=gTotal+getGreen(origPx)
    bTotal=bTotal+getBlue(origPx)

    In order to show the blurred picture change the last line in you main to 

    show( makeBlurredPicture(pic,blurAmount) )
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