Color grading LUT generator

LUTGenerator.pde

int block = 32;

void setup() {
  size( block * block, block );
}
void draw() {
  loadPixels();
  int scale = 256 / block;
  for (int r=0; r<block; r++)
  for (int g=0; g<block; g++)
  for (int b=0; b<block; b++)
  {
    pixels[ g * width + r + b * block ] = color( r * scale, g * scale, b * scale );  
  }
  
  updatePixels();
}
void keyPressed()
{
  String fn = "LUT" + block + ".png";
  print("saved " + fn);
  save(fn);
}