java/examples/Topics/Image Processing/Brightness/applet/Brightness.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 Brightness extends PApplet {
+
+/**
+ * Brightness
+ * by Daniel Shiffman. 
+ * 
+ * Adjusts the brightness of part of the image
+ * Pixels closer to the mouse will appear brighter. 
+ */
+ 
+PImage img;
+
+public void setup() {
+  size(200, 200);
+  frameRate(30);
+  img = loadImage("wires.jpg");
+}
+
+public void draw() {
+  loadPixels();
+  for (int x = 0; x < img.width; x++) {
+    for (int y = 0; y < img.height; y++ ) {
+      // Calculate the 1D location from a 2D grid
+      int loc = x + y*img.width;
+      // Get the R,G,B values from image
+      float r,g,b;
+      r = red (img.pixels[loc]);
+      //g = green (img.pixels[loc]);
+      //b = blue (img.pixels[loc]);
+      // Calculate an amount to change brightness based on proximity to the mouse
+      float maxdist = 50;//dist(0,0,width,height);
+      float d = dist(x,y,mouseX,mouseY);
+      float adjustbrightness = 255*(maxdist-d)/maxdist;
+      r += adjustbrightness;
+      //g += adjustbrightness;
+      //b += adjustbrightness;
+      // Constrain RGB to make sure they are within 0-255 color range
+      r = constrain(r,0,255);
+      //g = constrain(g,0,255);
+      //b = constrain(b,0,255);
+      // Make a new color and set pixel in the window
+      //color c = color(r,g,b);
+      int c = color(r);
+      pixels[loc] = c;
+    }
+  }
+  updatePixels();
+}
+
+  static public void main(String args[]) {
+    PApplet.main(new String[] { "Brightness" });
+  }
+}