combining two images, multiplying RGB values to vignette an image Jython/Python

Question

https://i.stack.imgur.com/AAtUD.jpg https://i.stack.imgur.com/eouLY.jpg

images to use for code.

the end result i am trying to do is combine the vignette picture and the CGI picture because the vignette images RGB values are darker towards the edges i need to multiply the original images corresponding pixels by the smaller numbers towards the edges, should make the picture have a darker frame around the edges of the original picture.

here's the code so far:

  def addVignette(inputPic, vignette):
   #create empty canvas to combine images correctly
   canvas = makeEmptyPicture(getWidth(inputPic), getHeight(inputPic))

   for x in range(0, getWidth(inputPic)):
     for y in range(0, getHeight(inputPic)):
       px = getPixel(canvas, x, y)
       inputPx = getPixel(inputPic, x, y)
       vignettePx = getPixel(vignette, x, y)

      #make a new color from these values
       newColour = getNewColorValues(vignettePx,inputPx)

      #then assign this new color to the current pixel of the input image
       setColor(px, newColour)

  explore(canvas)

def getNewColourValues(inputPx, vignettePx):

   inputRed = getRed(inputPx)
   vignetteRed = getRed(vignettePx)
   inputGreen = getGreen(inputPx)
   vignetteGreen = getGreen(vignettePx)
   inputBlue = getBlue(inputPx)
   vignetteBlue = getBlue(vignettePx)


   newRGB= setColor(inputPx,inputRed,inputGreen,inputBlue)*(vignettePx,vignetteRed,vignetteGreen,vignetteBlue)


   newColour = makeColor(newRGB) 

   return newColour

def newPicture(newColour):

 folder = pickAFolder()
 filename = requestString("enter file name: ")
 path = folder+filename+".jpg"

 writePictureTo(inputPic, path)

when testing use vignette_profile image first then CGI image also the saving image doesnt work even though i've been trying to get it to work any help will be appreciated.

the result i'm trying to get is something along the lines of this: http://i.stack.imgur.com/mucCs.jpg — Master_Cdawgg, Sep 06 '14 at 14:21

score 0 · Answer 1 · answered Sep 06 '14 at 15:02

0

You can also try doing this in CV. Single pixel manipulation and file I/O are pretty straight forward.

img = cv2.imread('test.jpg')
pixel = img[10,10]

Ive never had any issues with file I/O in CV. Chances are its a permission error or excess white space.

cv2.imwrite('messigray.png',img)

You can also do some easy image previewing which in this case would let you experiment with the output a little more.

answered Sep 06 '14 at 15:02

Meozaa

95
9

thanks for an alternative solution to get the vignette working – Master_Cdawgg Sep 12 '14 at 16:23

score 0 · Accepted Answer · edited Sep 07 '14 at 07:09

Saving the image

Let me start with saving the image. What I can see from the code you posted, you never actually call the newPicture() function which is why it's not saving the image. Also I noticed in the newPicture function that you don't pass a reference of the new image to the function.

Please my solution to this below. I have changed the function name from newPicture to saveNewImage()

Adding the Vignette

Please see the comments for the code block denote by ******* in the getNewColorValues() function.

You run the Main() function for this script to work

# Main function.
# *** THIS FUNCTION NEEDS TO BE CALLED IN THE CONSOLE ***
# i.e >>> main()

def main():

  # Choose the files you wish to use
  inputFile = pickAFile()
  vignetteFile = pickAFile()

  # Turn both files into picture objects
  inputPic = makePicture(inputFile)
  vignette = makePicture(vignetteFile)

  # addVignette() function combines the input picture and vignette together
  # and returns the result as a new picture object
  newImage =  addVignette(inputPic, vignette)

  # saveNewImage() function stores the new image as file
  saveNewImage(newImage)


# Main() calls this function to add input picture and vignette together  
def addVignette(inputPic, vignette):

  # Create empty canvas
  canvas = makeEmptyPicture(getWidth(inputPic), getHeight(inputPic))

  # Iterate through all the pixels of the input image. x and y are
  # used as the current coordinates of the pixel
  for x in range(0, getWidth(inputPic)):
    for y in range(0, getHeight(inputPic)):

      # Get the current pixels of inputPic and vignette
      inputPixel = getPixel(inputPic, x, y)
      vignettePixel = getPixel(vignette, x, y)

      # The getNewColorValues() function, makes a new color from those
      # values
      newColor = getNewColorValues(inputPixel, vignettePixel)

      # Assign this new color to the current pixel of the canvas
      px = getPixel(canvas, x, y)      
      setColor(px, newColor)

  # Show the result of combiming the input picture with the vignette
  explore(canvas)

  # return the new image to main() function.
  return canvas

# Called from the addVignette() function to add the color values from
# the input picture and vignette together. It returns a new color
# object
def getNewColorValues(inputPixel, vignettePixel):

  # Get the individual colour values
  inputRed = getRed(inputPixel)
  vignetteRed = getRed(vignettePixel)
  inputGreen = getGreen(inputPixel)
  vignetteGreen = getGreen(vignettePixel)
  inputBlue = getBlue(inputPixel)
  vignetteBlue = getBlue(vignettePixel)

  # ***********************************************************
  # Most important part. This will determine if the pixel is darkent
  # and by how much. How it works is the darker the vignette pixel the less that will
  # be taken away from 255. This means the result of `255 - vignetteRed` will be a higher
  # value which means more will be taken away from the input colour.
  # The light the vignette pixel the less that will be taken away from input pixel

  newR = inputRed - (255 - vignetteRed)
  newG = inputGreen - (255 - vignetteGreen)
  newB = inputBlue - (255 - vignetteBlue)
  # ***********************************************************

  newC = makeColor(newR, newG, newB)
  return newC

# Called from the main() function in order to save the new image  
def saveNewImage(newImage):

  folder = pickAFolder()
  filename = requestString("Please enter file name: ")
  path = folder + filename + ".jpg"

  writePictureTo(newImage, path)

combining two images, multiplying RGB values to vignette an image Jython/Python

2 Answers2

Saving the image

Adding the Vignette

You run the Main() function for this script to work