Day 9

Day 8/decode.py

@@ -74,7 +74,7 @@ if snail.count("0") != bits.count("0") or snail.count("1") != bits.count("1"):
     print("Bits do not match")
     exit()
 
-im = Image.new('RGB', im.size)
+im = Image.new('RGB', im.black)
 pix = im.load()
 
 for tileY in range(0, numTiles):

Day 9/decode.py

@@ -0,0 +1,38 @@
+#!/usr/bin/python
+
+from PIL import Image
+
+imageOriginal = Image.open("medium_64_original.png")
+imageFake     = Image.open("medium-64_decompressed.png")
+
+pixOriginal   = imageOriginal.load()
+pixFake       = imageFake.load()
+
+if imageOriginal.size != imageFake.size:
+    print("Images differ in Size")
+    exit()
+
+diffs = []
+
+Size = imageOriginal.size
+for y in range(Size[0]):
+    for x in range(Size[1]):
+        if pixOriginal[x,y] != pixFake[x,y]:
+            diffs.append([x,y])
+
+x0 = min([diff[0] for diff in diffs])
+x1 = max([diff[0] for diff in diffs])
+y0 = min([diff[1] for diff in diffs])
+y1 = max([diff[1] for diff in diffs])
+
+imageNew = Image.new('RGB', Size, "white")
+pix = imageNew.load()
+
+for x in range(x0, x1+1):
+    for y in range(y0, y1+1):
+        pix[x,y] = (0,0,0,255)
+
+for diff in diffs:
+    pix[diff[0], diff[1]] = (255,255,255,255)
+
+imageNew.save("decoded.png")

Teaser/_ZOoxjUSe1OVB7OPoVrsX.pdf.extracted/break_santa.py

@@ -0,0 +1 @@
+#!/usr/bin/python