PImage myImage; //define an image object
myImage = loadImage("memorial.jpg"); //load it
size(myImage.width,myImage.height); //size it to fit the window
image(myImage, 0,0); //display the image
int filter = 1; //choose a filter
switch(filter) {
case 1:
  filter(THRESHOLD, .6); //every pixel below .6 becomes black
  break;
case 2:
  filter(GRAY); //all pixels get the average value of their rgb
  break;
case 3:
  filter(INVERT); //all pixels get the opposite value of their rgb
  break; // (i.e. 255-r)
case 4:
  filter(POSTERIZE, 2); //limits each channel of the image to 2
  break; // colors
case 5:
  filter(BLUR, 1); // executes a Guassian blur with radius 1
  break;
case 6:
  filter(BLUR, 6); // executes a Guassian blur with radius 6
  break;
}
save("memorial_filter_"+filter+".jpg"); // save the image
// as a numbered file