PImage img;

void setup() {
	size(480, 640);
	img = loadImage("satou.jpg");
}

void draw() {
	loadPixels(); 
	// Since we are going to access the image's pixels too  
	img.loadPixels(); 
	for (int x = 0; x < img.width; x++) {
		for (int y = 0; y < img.height; y++ ) {
			// Calculate the 1D pixel location
			int loc = x + y*img.width;
			// Get the R,G,B values from image
			float r = red   (img.pixels[loc]);
			float g = green (img.pixels[loc]);
			float b = blue  (img.pixels[loc]);
			// Change brightness according to the mouse here
			float adjustBrightness = ((float) mouseX / width) * 8.0;
			r *= adjustBrightness;
			g *= adjustBrightness;
			b *= adjustBrightness;
			// Constrain RGB to between 0-255
			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);
			pixels[loc] = c;
		}
	}
	updatePixels();
}