Answer: Pixel Puzzle #348

The hidden picture is a planet with a ring!

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 = [
    "0000000000000000",
    "0000000000000000",
    "0000000000000000",
    "0000001111000020",
    "0000111111110000",
    "2220111113330000",
    "0022213331111200",
    "0003331111111000",
    "0001111111113000",
    "0001111113322200",
    "0000113331110222",
    "0000331111110000",
    "0000001111000000",
    "0000000000200000",
    "0000000000000000",
    "0000000000000000",
]
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: 16 × white
• Row 2: 16 × white
• Row 3: 16 × white
• Row 4: 6 × white, 4 × green, 4 × white, 1 × yellow, 1 × white
• Row 5: 4 × white, 8 × green, 4 × white
• Row 6: 3 × yellow, 1 × white, 5 × green, 3 × teal, 4 × white
• Row 7: 2 × white, 3 × yellow, 1 × green, 3 × teal, 4 × green, 1 × yellow, 2 × white
• Row 8: 3 × white, 3 × teal, 7 × green, 3 × white
• Row 9: 3 × white, 9 × green, 1 × teal, 3 × white
• Row 10: 3 × white, 6 × green, 2 × teal, 3 × yellow, 2 × white
• Row 11: 4 × white, 2 × green, 3 × teal, 3 × green, 1 × white, 3 × yellow
• Row 12: 4 × white, 2 × teal, 6 × green, 4 × white
• Row 13: 6 × white, 4 × green, 6 × white
• Row 14: 10 × white, 1 × yellow, 5 × white
• Row 15: 16 × white
• Row 16: 16 × white