java change image colour pixels

Question

write a program that isolates each pixel's colour to only its brightest channel. eg: • Bright red will stay bright red • Black will stay black • Nearly-white with a bluish tint will be only bright blue For pixels where there's a tie for the 'brightest channel', it doesn't matter how you break that tie.

Answer 1

while ( aPic.hasNext() ) {
  p = aPic.next(); // set p to the next pixel
  r = p.getRed();
  g = p.getGreen();
  b = p.getBlue();
  
  int maxChannelValue = Math.max(r, g, b); // figure out the value of the brightest channel
  // maxChannelValue is an int that equals one (or more) of r, g, or b

  if (maxChannelValue == r) { // if red is the brightest channel
    p.setGreen(0);
    p.setBlue(0); // turn off the non red values
  } else if (maxChannelValue == g) { // same but for green
    p.setRed(0);
    p.setBlue(0);
  } else { // same but for blue
    p.setRed(0);
    p.setGreen(0);
  }
}