Color

With a three-dimensional array you get a RGB image.

image0

Here is the code that creates the image:


import numpy as np
from PIL import Image

a = np.zeros((200, 200, 3), dtype=np.uint8)
a[:, :, 0] += 255
a[:, :, 2] += 128

im = Image.fromarray(a)
im.save('pink.png')

Note

  • the three dimensions are (y-size, x-size, colorchannel)

  • the third dimension has to have the size 3

  • the three color channels are red [0], green [1], blue [2]

  • a 0 in a color channel means that color is inactive

  • a 255 in a color channel means that the color is at maximum saturation

Using sliced assignments, you can modify each color channel separately.

Challenges:

  • create a pure green square

  • create a purple rectangle

  • create an orange rectangle

  • create a white image

image1