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Access pixels on image

More about pixels

We have already learned how to make a pure color image using pixels and change a pixel on the image. Now, we will learn how to identify pixels in existing images.

For information about how to use lists and tuples in Python see more on these pages: Data Structure

Get image data

# Remember to import Image
from PIL import Image
Image.size
Image.size[0]
Image.size[1]

Image.size gives a (width, height) value of an image. Image.size[0] gives the width of the image and Image.size[1] gives the height of the image.

Let’s see an example

# Remember to import Image
from PIL import Image
img=Image.new('RGB', (200,100),(100,100,100))
# Let's print out the image details:
print(img.size) 
print(img.size[0])
print(img.size[1])

The above code will print out:

(200, 100)  
200  
100

Here the image size is 200 by 100. The width is 200, the height is 100.

Get pixel information

img.getpixel(x,y) will get a Color value at a certain position. Position is a (width, height) value of that pixel. Color is the RGB Color of that pixel.

Let’s see an example

# Remember to import Image
from PIL import Image
img=Image.new('RGB', (200,100),"yellow")
color=img.getpixel((100,50))
# Let's print out the pixel color
print(color)

The above code will print out:

(255, 255, 0)

Get RGB value of a pixel

Each RGB color gives a tuple value (red, green, blue) of a pixel. Color[0] gives the red value of the pixel, Color[1] gives the green value of the pixel, and Color[2] gives the blue value of the pixel.

Let’s see an example

# Remember to import Image
from PIL import Image
img=Image.new('RGB', (200,100),"yellow")
color=img.getpixel((100,50))

# Let's print out the RGB value of a pixel
print(color[0])
print(color[1])
print(color[2])

The above code will print out:

255
255
0

Here the RGB value breaks down so that red has a value of 255, green has a value of 255, and blue has a value of 0.