pixel_canvas_fetch.py

import io
import requests
from PIL import Image
from itertools import chain

BIGCHUNK_CHUNK_WIDTH = 15
CHUNK_PIXEL_WIDTH = 64
BYTE_BIT_SIZE = 8
COLOR_BIT_SIZE = 4
CHUNK_BYTE_SIZE = int((CHUNK_PIXEL_WIDTH ** 2) * (COLOR_BIT_SIZE / BYTE_BIT_SIZE))
BIGCHUNK_PIXEL_WIDTH = BIGCHUNK_CHUNK_WIDTH * CHUNK_PIXEL_WIDTH

def get_rect(x, y, width, height):
    return (x, y, x+width, y+height)

def get_big_chunk(pixel_x, pixel_y):
    chunk_x = pixel_x // CHUNK_PIXEL_WIDTH
    chunk_y = pixel_y // CHUNK_PIXEL_WIDTH
    data = requests.get(f'https://api.pixelcanvas.io/api/bigchunk/{chunk_x}.{chunk_y}.bmp')
    return data.content


pallet_colors = [
    (255, 255, 255),  # White 
    (228, 228, 228),  # Light Grey 
    (136, 136, 136),  # Dark Grey 
    ( 34,  34,  34),  # Black 
    (255, 167, 209),  # Pink 
    (229,   0,   0),  # Red 
    (229, 149,   0),  # Orange 
    (160, 106,  66),  # Brown 
    (229, 217,   0),  # Yellow 
    (148, 224,  68),  # Light Green 
    (  2, 190,   1),  # Green 
    (  0, 211, 221),  # Cyan 
    (  0, 131, 199),  # Teal 
    (  0,   0, 234),  # Blue 
    (207, 110, 228),  # Light Purple
    (130,   0, 128)   # Purple 
]

image = Image.new('RGB', (BIGCHUNK_PIXEL_WIDTH,)*2)

data = get_big_chunk(960, 960)

chunk_pixel_offsets = range(0, BIGCHUNK_PIXEL_WIDTH, CHUNK_PIXEL_WIDTH)
with io.BytesIO(data) as bio:
    for y_offset in chunk_pixel_offsets:
        for x_offset in chunk_pixel_offsets:
            img = Image.frombuffer('P', (CHUNK_PIXEL_WIDTH,)*2, bio.read(CHUNK_BYTE_SIZE), 'raw', f'P;{COLOR_BIT_SIZE}')
            img.putpalette(list(chain(*pallet_colors)))
            image.paste(img, get_rect(x_offset, y_offset, *(CHUNK_PIXEL_WIDTH,)*2))

image.save('attempt.png')

Adapted from:
https://github.com/DiamondIceNS/StarlightGlimmer/blob/master/objects/chunks.py#L88
http://effbot.org/zone/creating-palette-images.htm