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@tgs
Created November 25, 2015 06:18
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see hidden areas in xkcd 1608 - requires bottle.py, PIL(low), numpy
#!/usr/bin/env python
import StringIO
import numpy as np
from bottle import route
from bottle import run
from bottle import abort
import Image
import requests
base_url = 'http://xkcd.com/'
@route('/<image:path>')
def proxy(image):
resp = requests.get(base_url + image)
if resp.status_code != 200:
abort(resp.status_code)
if 'png' in resp.headers['content-type']:
return munge_png(resp.content)
return resp.content
def munge_png(png_in):
im = Image.open(StringIO.StringIO(png_in))
im = im.convert('RGBA')
data = np.array(im) # "data" is a height x width x 4 numpy array
red, green, blue, alpha = data.T # Temporarily unpack the bands for readability
# Replace white with red... (leaves alpha values alone...)
deception = (red == 1) & (blue == 1) & (green == 1)
data[..., :-1][deception.T] = (255, 0, 0) # Transpose back needed
im2 = Image.fromarray(data)
png_out_io = StringIO.StringIO()
im2.save(png_out_io, format='PNG')
return png_out_io.getvalue()
run(host='localhost', port=8080, debug=True)
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