To make your own colormap you can use matplotlib `LinearSegmentedColormap`. In the below code I show you how to use it and how to enter colors in a few different formats.

```py
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.colors import ListedColormap, LinearSegmentedColormap
import matplotlib.colors as mcolors

# I'll show you multiple ways to enter colors
blue = (0, 0, 1, 1)  # you can use a rgba tuple
white = mcolors.to_hex('white') # a name or a hex string, here we are converting from a name to a hex string
cmap = LinearSegmentedColormap.from_list("mycmap", [blue, white, 'red'])

gradient = np.linspace(0, 1, 256)
gradient = np.vstack((gradient, gradient))

# now you pass in your colormap object into the cmap argument in pyplot plotting methods
plt.imshow(gradient, aspect='auto', cmap=cmap)
```
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