image_to_wavetable.py

# Converts an 8-bit RGB PNG to a 16-bit WAV wavetable bank.
# The brightness of the pixel at (x, y) converts to the value of sample x in bank y.

import sys
import os
import numpy as np
import scipy.io.wavfile
import imageio

path = sys.argv[1]
x = imageio.imread(path)
x = np.sum(x, 2) / (3*256)
x = 2 * x - 1
x = x.flatten()
x = (x * 32767).astype(np.int16)

(root, _) = os.path.splitext(path)
wav_path = root + ".wav"
scipy.io.wavfile.write(wav_path, 44100, x)
print("Wrote " + wav_path)