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beans42/grayscale.py

Created April 24, 2020 02:42
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grayscale.py
from PIL import Image
def greyscale(img: Image) -> Image:
img_width, img_height = img.size
pixels = img.load()
#for every pixel
for i in range(img_width):
for j in range(img_height):
rgb = pixels[i, j]
brightness = int(rgb[0] * 0.2126 + rgb[1] * 0.7152 + rgb[2] * 0.0722) #relative luminance = 0.2126R + 0.7152G + 0.0722B
pixels[i, j] = ( brightness, brightness, brightness )
return img
image = Image.open(input() + ".png")
image = greyscale(image)
image.show()
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