In symmetrical colour by number pictures you are only given the numbers for half the pictures. Use symmetry to work out the rest of the numbers and so the rest of the picture.
If you know something about the properties of a picture you can reconstruct the image despite storing fewer numbers! That is called image compression.
Some squares have a number that tells you the colour to colour in that square. Look up the colours in the key. Other squares have no number. Work out what colour they are by symmetry.
So, for example with a colour lookup table 1 Blue, 2 Red a row with numbers (where _ means blank) 1 1 1 1 1 2 2 2 _ _ _ _ _ _ _ _ would mean colour five pixels blue and then by symmetry three pixels red, then three pixels red and five pixels blue.
Complete them in either of two ways (two algorithms). Either:
- Use symmetry to first fill out the rest of the grid of numbers to create a normal colour by number pixel, OR
- Colour in the numbers given, then copy the colours on to the other side.
- Puzzle Sheet: Symmetrical Colour by Number Pixel Puzzle 4 [pdf] TO PRINT
- Spreadsheet Puzzle Sheet: Easter Symmetrical Pixel Puzzle [xlsx] COMPUTER
- Raw Puzzle: Raw version of Symmetrical Colour by Number Pixel puzzle 4 to include in your own handouts [pdf] TO PRINT
- Solution Sheet: Solution to Symmetrical Colour By Number Puzzle 4 [pdf]
by Elisa Huen
For more …
- Visit our main pixel puzzle page
- More symmetrical pixel puzzles
- Visit our Christmas computing page
- Visit our “Bit of cs4fn” puzzle page