Answer: Pixel Puzzle #307

The hidden picture is a pixel creature!

The picture as Python

Here is the same picture stored as numbers in a Python list. The program reads each number and prints a symbol for it, so you can see the picture appear in the Python shell.

picture = [
    "000000000000",
    "000000000000",
    "000110011000",
    "001111111100",
    "001120021100",
    "001130031100",
    "001110011100",
    "001110011100",
    "000110011000",
    "001100001100",
    "000000000000",
    "000000000000",
]
symbols = " #@*"

for row in picture:
    line = ""
    for number in row:
        line = line + symbols[int(number)]
    print(line)

When you run it, it prints:

   ##  ##
  ########
  ##@  @##
  ##*  *##
  ###  ###
  ###  ###
   ##  ##
  ##    ##

Squashing the picture smaller

Computers often save space with a trick called run-length encoding. Instead of storing every pixel, they count how many of the same colour are in a row. Here’s this picture written that way:

Show the run-length code

• Row 1: 12 × white
• Row 2: 12 × white
• Row 3: 3 × white, 2 × purple, 2 × white, 2 × purple, 3 × white
• Row 4: 2 × white, 8 × purple, 2 × white
• Row 5: 2 × white, 2 × purple, 1 × white, 2 × white, 1 × white, 2 × purple, 2 × white
• Row 6: 2 × white, 2 × purple, 1 × navy, 2 × white, 1 × navy, 2 × purple, 2 × white
• Row 7: 2 × white, 3 × purple, 2 × white, 3 × purple, 2 × white
• Row 8: 2 × white, 3 × purple, 2 × white, 3 × purple, 2 × white
• Row 9: 3 × white, 2 × purple, 2 × white, 2 × purple, 3 × white
• Row 10: 2 × white, 2 × purple, 4 × white, 2 × purple, 2 × white
• Row 11: 12 × white
• Row 12: 12 × white