java/examples/Basics/Image/Alphamask/Alphamask.pde

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+/**
+ * Alpha Mask. 
+ * 
+ * Loads a "mask" for an image to specify the transparency 
+ * in different parts of the image. The two images are blended
+ * together using the mask() method of PImage. 
+ */
+ 
+PImage img;
+PImage maskImg;
+
+void setup() {
+  size(200, 200);
+  img = loadImage("test.jpg");
+  maskImg = loadImage("mask.jpg");
+  img.mask(maskImg);
+  imageMode(CENTER);
+}
+
+void draw() {
+  background(map(mouseX+mouseY, 0, width+height, 0, 255));
+  image(img, width/2, height/2);
+  image(img, mouseX, mouseY);
+}

java/examples/Basics/Image/Alphamask/applet/Alphamask.java

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+import processing.core.*; 
+
+import java.applet.*; 
+import java.awt.*; 
+import java.awt.image.*; 
+import java.awt.event.*; 
+import java.io.*; 
+import java.net.*; 
+import java.text.*; 
+import java.util.*; 
+import java.util.zip.*; 
+import java.util.regex.*; 
+
+public class Alphamask extends PApplet {
+
+/**
+ * Alpha Mask. 
+ * 
+ * Loads a "mask" for an image to specify the transparency 
+ * in different parts of the image. The two images are blended
+ * together using the mask() method of PImage. 
+ */
+ 
+PImage img;
+PImage maskImg;
+
+public void setup() 
+{
+  size(200,200);
+  img = loadImage("test.jpg");
+  maskImg = loadImage("mask.jpg");
+  img.mask(maskImg);
+}
+
+public void draw() 
+{
+  background((mouseX+mouseY)/1.5f);
+  image(img, 50, 50);
+  image(img, mouseX-50, mouseY-50);
+}
+
+  static public void main(String args[]) {
+    PApplet.main(new String[] { "Alphamask" });
+  }
+}

java/examples/Basics/Image/Alphamask/applet/Alphamask.pde

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+/**
+ * Alpha Mask. 
+ * 
+ * Loads a "mask" for an image to specify the transparency 
+ * in different parts of the image. The two images are blended
+ * together using the mask() method of PImage. 
+ */
+ 
+PImage img;
+PImage maskImg;
+
+void setup() 
+{
+  size(200,200);
+  img = loadImage("test.jpg");
+  maskImg = loadImage("mask.jpg");
+  img.mask(maskImg);
+}
+
+void draw() 
+{
+  background((mouseX+mouseY)/1.5);
+  image(img, 50, 50);
+  image(img, mouseX-50, mouseY-50);
+}