image processing - Changing pixel color Python

Question

I am suppose to get an image from my fluke robot and determine the color of each pixel in my image. Then if the pixel is mostly red, change it to completely green. If the pixel is mostly green, change it to completely blue. If the pixel is mostly blue, change it to completely red. This is what I am able to do, but I can't get it to work to get the image I have to change. There is no syntax error, it is just semantic I am having trouble with. I am using python.

My attempted code:

import getpixel
getpixel.enable(im)  
r, g, b = im.getpixel(0,0)  
print 'Red: %s, Green:%s, Blue:%s' % (r,g,b)

Also I have the picture saved like the following:

pic1 = makePicture("pic1.jpg"):
    for pixel in getpixel("pic1.jpg"):
        if pixel Red: %s:
           return Green:%s
        if pixel Green:%s: 
           return Blue:%s

Answer 1

I assume you're trying to use the Image module. Here's an example:

from PIL import Image
picture = Image.open("/path/to/my/picture.jpg")
r,g,b = picture.getpixel( (0,0) )
print("Red: {0}, Green: {1}, Blue: {2}".format(r,g,b))

Running this on this image I get the output:

>>> from PIL import Image
>>> picture = Image.open("/home/gizmo/Downloads/image_launch_a5.jpg")
>>> r,g,b = picture.getpixel( (0,0) )
>>> print("Red: {0}, Green: {1}, Blue: {2}".format(r,g,b))
Red: 138, Green: 161, Blue: 175

EDIT: To do what you want I would try something like this

from PIL import Image
picture = Image.open("/path/to/my/picture.jpg")

# Get the size of the image
width, height = picture.size()

# Process every pixel
for x in width:
   for y in height:
       current_color = picture.getpixel( (x,y) )
       ####################################################################
       # Do your logic here and create a new (R,G,B) tuple called new_color
       ####################################################################
       picture.putpixel( (x,y), new_color)