Finding RGB values

Question

I want to write a function that prints out the color values, RGB, of a picture. The pictures are either colored all red, green, yellow or white.

What I have is the following:

def findColor():
    pic=takePicture()
    red = 0   
    green = 0
    blue = 0 
    size = getWidth(pic)*getHeight(pic)
    for pix in getPixels(pic):
        r = getRed(pix)
        g = getGreen(pix)
        b = getBlue(pix)
        red = red + r
        green = green + g
        blue = blue + b 
    print(red//size,green//size,blue//size)

Or a code that gives me similar values as above:

def findColor():
    pic=takePicture()
    for pix in getPixels(pic):
        r = getRed(pix)
        g = getGreen(pix)
        b = getBlue(pix)
    print(r,g,b)

Are these codes a correct way of getting the RGB values? I believe the second code isn't accurate if the picture contained different colors.

"Are these codes a correct way of getting the RGB values?" Let me answer that question with another question. When you run them, do you get the output that you want? — Kevin
@Kevin Yes, if I set restrictions like the pictures I linked. And no, if the restrictions aren't there, for example if the picture was a mixture of red, black and purple. I will like to know if the first code is the correct way. — Robben
The first one prints the average of all pixels in the image. The second one prints the color of the bottom-right pixel in the image. If your image contains exactly one color, then they'll both print the same thing. — Kevin
@Kevin Hm, so the correct way of finding the RGB values will then be my first code? — Robben
It's not clear to me what "finding the RGB values" means, so I can't really answer that. — Kevin

Kevin Kevin · Accepted Answer · 2014-10-24T19:15:53

If you just want to print the rgb value for each individual pixel, your second code block will work if you fix the indentation.

def findColor():
    pic=takePicture()
    for pix in getPixels(pic):
        r = getRed(pix)
        g = getGreen(pix)
        b = getBlue(pix)
        print(r,g,b)

Finding RGB values

2 Answers