grayscale

Creating Images

The Pillow library can draw two-dimensional NumPy arrays as grayscale images:

Here is the code that generates the image:

.. literalinclude:: grayscale.py

Note that:

• the two dimensions are written as a tuple (y-size, x-size)
• the data type is np.uint8 (numbers from 0..255)
• the example adds 128 to each value to obtain a gray image:

If you are using Jupyter Notebook, you can conveniently display any Pillow image variable by putting the image variable into a Jupyter cell, e.g.:

im

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Challenges:

• create a rectangular image
• create a black square-shaped image
• create an image that is entirely white