java/examples/Basics/Image/Transparency/Transparency.pde

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+/**
+ * Transparency. 
+ * 
+ * Move the pointer left and right across the image to change
+ * its position. This program overlays one image over another 
+ * by modifying the alpha value of the image with the tint() function. 
+ */
+
+PImage a, b;
+float offset;
+
+void setup() {
+  size(200, 200);
+  a = loadImage("construct.jpg");  // Load an image into the program 
+  b = loadImage("wash.jpg");   // Load an image into the program 
+}
+
+void draw() { 
+  image(a, 0, 0);
+  float offsetTarget = map(mouseX, 0, width, -b.width/2 - width/2, 0);
+  offset += (offsetTarget-offset)*0.05; 
+  tint(255, 153);
+  image(b, offset, 20);
+}
+
+
+
+
+