MFM bg pixelart

#!/usr/bin/env python3

# import colorsys
from PIL import Image

# * path of image
img_path = 'sample.png'

# * size of output (maximum square: 13x13 (2886bytes) )
col = 13
row = 13

img = Image.open(img_path)

template = "$[bg.color={} 　]"

img_resized = img.resize((col, row))
px = img_resized.load()

outstr = ""

for i in range(row):
    value = 1 - i/row
    for j in range(col):
        hue = j/col
        colorcode = ''.join([format(int(x / 255 * 15), '1x') for x in px[j,i][:3]])
        # generates rainbow: https://misskey.io/notes/9abvp2290s
        #   colorcode = ''.join([format(int(x * 15), 'x') for x in colorsys.hsv_to_rgb(hue, value, 1)])
        outstr += template.format(colorcode)
    outstr += '\n'        
print("length:", len(outstr))
print(outstr)