Image Puzzles

This is a short section to look at type of puzzle built out of image manipulation code.

Code To Fix the Pixels

• There is an image of some unknown puzzle object
• Red/green/blue values have been distorted, hiding the real image
• Write code to fix the pixels
• Recover the original image to solve the puzzle

Gold Puzzle

Here we have the "gold" puzzle image -- fix it to see the real image

Gold puzzle parameters:

• The green and blue values are all just random values in the range 0..255 ("snow")
• The data of the real image is exclusively in the red values
• In addition, the red values have all been divided by 10 (dark)
• The green/blue snow is obscuring the real image
• Write code to recover the real image

image = new SimpleImage("puzzle-gold.png"); for (pixel: image) { // your code here } print(image);

Solution code:

// Strategy: zero out blue and green as they
// are just garbage data.
// Then scale red up by 10x to see the real
// image in red.

  // your code here
  pixel.setGreen(0);
  pixel.setBlue(0);
  pixel.setRed(pixel.getRed() * 10);

Seeing Red

In this case, our solution shows the image, but it's all in red. What we have here is basically a black-and-white image, but it is shown in the black-red range, rather than the usual black-white. For this section, we'll say that's good enough. We'll see how to fix the red image so it looks like a proper black-and-white image in a later section.

> exercises