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JyThon _ Image Processing

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									JyThon : Image Processing

      NATAPON PANTUWONG
              Manipulate Pictures

 Open image file with JyThon
>>> file = pickAFile()
>>> print file
/user/guzdial/mediasource/babara.jpg
>>> picture = makePicture(file)
>>> show(picture)
>>> print picture
Picture,
  filename/Users/guzdial/mediasources/babara.jpg
  height 294 width 222
               Manipulate Picture

>>> print getWidth(picture)
>>> print getHeight(picture)
>>> pixel = getPixel(picture,1,1)
>>> print pixel
Pixel, color = color r =168 g=131 b=105
>>> pixel = getPixels(picture)
>>> print pixel[0]
Pixel, color = color r =168 g=131 b=105
             Manipulate Picture

>>> print getX(pixel)
>>> print getY(pixel)
>>> print getRed(pixel)
>>> setRed(pixel,255)
>>> color = getColor(pixel)
>>> print color
color r=255,g =131, b=105
>>> newColor = makeColor(0,100,0)
>>> setColor(pixel,newColor)
               Manipulate Picture

>>> print distance(color,newcolor)
>>> makeLighter(color)
>>> makedarker(color)
>>> writePictureTo (picture,
 “/Users/guzdial/newpicture.jpg”)
               Manipulate Picture

>>> file = “Users/guzdial/mediasources/katie.jpg”
>>> pict = makePicture(file)
>>> show(pict)
>>> setColor (getPixel(pict,10,100),yellow)
>>> setColor (getPixel(pict,10,101),yellow)
>>> setColor (getPixel(pict,10,102),yellow)
>>> setColor (getPixel(pict,10,103),yellow)
>>> setColor (getPixel(pict,10,104),yellow)
>>> repaint(pict)
             Using Loops in Pictures

>>> for pixel in getPixels(picture)
        value = getRed(pixel)
        setRed(pixel,value)
>>> for pixel in getPixels(picture)
        value = getRed(pixel)
        setRed(pixel,value*0.5)
             Using Loops in Picture

 Your Turn!!!
 Make sun set picture from beach picture. Assume
  that when sun set, blue and green will be decreased
  30%.
 Negative Image which invert black and white of gray
  level.
 Grayscale image which computed by average of red,
  green and blue of each pixel.
     Looping Across the Pixels with range

>>> for x in range(1,getWidth(picture))
        for y in range(1,getHeight(picture))
            pixel = getPixel(picture,x,y)

Your Turn!!!
Let lighten the picture.
Mirror your image vertical or horizontal.
           Copying and Transforming Image

#Set up the source and target pictures
barbf = getMediaPath(“babara.jpg”)
barb = makePicture(barbf)
canvasf = getMediaPath(“7inx95in.jpg”)
canvas = makePicture(canvasf)
targetX = 1
for sourceX in range(1,getWidth(barb)):
   targetY = 1
    for sourceY in range(1,getHeight(barb)):
           color = getColor(getPixel(barb,sourceX,sourceY))
           setColor(getPixel(canvas,targetX,targetY),color)
           targetY = targetY + 1
   targetX = targetX + 1
show(barb)
show(canvas)
     Copying and Transforming Pictures

 Your Turn!!
 Translation with (10,15)
 Rotate CW 90 degree.
 Scale up by 2
 Scale down by 2
 Blurring
 Sharpening
 Blue Screen

								
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