functions/brightness.py

import os

from PIL import Image
from zeno import distill
from zeno.api import DistillReturn


def get_brightness(im):
    im_grey = im.convert("LA")
    width, height = im.size

    total = 0
    for i in range(0, width):
        for j in range(0, height):
            total += im_grey.getpixel((i, j))[0]

    return total / (width * height)


def get_border_brightness(im):
    im_grey = im.convert("LA")
    width, height = im.size

    total = 0
    for i in range(0, width):
        for j in range(0, 5):
            total += im_grey.getpixel((i, j))[0]

    for i in range(0, width):
        for j in range(height - 5, height):
            total += im_grey.getpixel((i, j))[0]

    return total / (width * 10)


@distill
def brightness(df, ops):
    imgs = [Image.open(os.path.join(ops.data_path, img)) for img in df[ops.data_column]]
    return DistillReturn(distill_output=[get_brightness(im) for im in imgs])


@distill
def border_brightness(df, ops):
    imgs = [Image.open(os.path.join(ops.data_path, img)) for img in df[ops.data_column]]
    return DistillReturn(distill_output=[get_border_brightness(im) for im in imgs])