pokemon-color-search/ingest.py

#!/usr/bin/env python3
from PIL import Image


def ingest_png(file_name: str) -> tuple[str, int, int, int, int]:
    print(f"Ingesting {file_name}")

    # image name - strip leading path and trailing extension
    name = file_name.rsplit("/", maxsplit=1)[1].split(".", maxsplit=1)[0]

    # read non-transparent pixels of image as RGB values
    pixels = [(r, g, b) for r, g, b, a in Image.open(file_name).convert("RGBA").getdata() if a > 0]

    # X metric - mean sq norm of all pixels
    x = sum(x * x + y * y + z * z for x, y, z in pixels) / len(pixels)

    # Y metrics - 2 * mean of color components
    yr_sum = 0
    yg_sum = 0
    yb_sum = 0
    for r, g, b in pixels:
        yr_sum += r
        yg_sum += g
        yb_sum += b
    yfactor = 2 / len(pixels)

    return name, x, yr_sum * yfactor, yg_sum * yfactor, yb_sum * yfactor


if __name__ == "__main__":
    import csv
    import os

    data = [ingest_png("pngs/" + fn) for f in os.listdir("pngs") if (fn := os.fsdecode(f)).endswith(".png")]
    with open("database.csv", "w") as outfile:
        writer = csv.writer(outfile, delimiter=",", quotechar="'")
        writer.writerows(data)