Compare and Contrast

 

SOURCE CODE

ColorHelper.java

package color;

import processing.core.PApplet;

import processing.core.PImage;

import model.HSBColor;


public class ColorHelper {

	public static HSBColor hsbColorFromImage(PImage img, PApplet applet, int hueRange) {
		img.loadPixels();
		int numberOfPixels = img.pixels.length;
		int[] hues = new int[hueRange];
		float[] saturations = new float[hueRange];
		float[] brightnesses = new float[hueRange];

		for (int i = 0; i < numberOfPixels; i++) {
			int pixel = img.pixels[i];
			int hue = Math.round(applet.hue(pixel));
			float saturation = applet.saturation(pixel);
			float brightness = applet.brightness(pixel);
			hues[hue]++;
			saturations[hue] += saturation;
			brightnesses[hue] += brightness;
		}

		// Find the most common hue.
		int hueCount = hues[0];
		int hue = 0;
		for (int i = 1; i < hues.length; i++) {
 			if (hues[i] > hueCount) {
				hueCount = hues[i];
				hue = i;
			}
		}

		// Return the color to display.
		float s = saturations[hue] / hueCount;
		float b = brightnesses[hue] / hueCount;
		return new HSBColor(hue, s, b);
	}
}

Compare and Contrast Hue.java

package ui;

import java.io.File;

import color.ColorHelper;
import model.HSBColor;
import processing.core.PApplet;
import processing.core.PImage;

@SuppressWarnings("serial")
public class CompareAndContrastHue extends PApplet {

	int fileIndex = 0;
	private String[] fileNames;
	private static String filePath = "../data/images/";

	static final int hueRange = 320;
	static final int hueTolerance = 40;
	private static final int imageWidth = 384;
	private static final int imageHeight = 268;

	public void setup() {
		size(3*imageWidth, imageHeight);
		background(0);
		noLoop();
		colorMode(HSB, hueRange - 1);
		// Read in images.
		File dir = new File(filePath);
		fileNames = dir.list();
		nextFileIndex();
	}

	public void draw() {
		PImage img = loadImage(filePath + fileNames[fileIndex]);
		img.loadPixels();
		img.resize(imageWidth, imageHeight);
		HSBColor color = ColorHelper.hsbColorFromImage(img, this, hueRange);
		image(img, imageWidth, 0, imageWidth, imageHeight);

		// Display image only showing dominant hue.
		drawImage(createImage(imageWidth, imageHeight, HSB), img.pixels, color,
				0, 0, imageWidth, imageHeight, false);

		// Display image excluding dominant hue.
		drawImage(createImage(imageWidth, imageHeight, HSB), img.pixels, color,
				2 * imageWidth, 0, imageWidth, imageHeight, true);
	}

	public void mousePressed() {
		nextFileIndex();
		redraw();
	}

	private void drawImage(PImage img, int[] pixels, HSBColor color,
			int x, int y, int width, int height, boolean showDominantHue) {
		img.loadPixels();
		// Manipulate photo, grayscale any pixel that isn't close to that hue.
		for (int i = 0; i < img.pixels.length; i++) {
			int pixel = pixels[i];
			float hue = hue(pixel);
			if (hueInRange(hue, color.h, hueTolerance) == showDominantHue) {
				float brightness = brightness(pixel);
				img.pixels[i] = color(brightness);
			} else {
				img.pixels[i] = pixel;
			}
		}
		image(img, x, y, width, height);
	}

	private void nextFileIndex() {
		while (true) {
			fileIndex++;
			if (fileIndex < fileNames.length) {
				if (fileNames[fileIndex].toLowerCase().contains(".jpg")) {
					break;
				}
			} else {
				fileIndex = 0;
			}
		}
	}

	private static boolean hueInRange(float hueA, float hueB, int tolerance) {
		return Math.abs(hueA - hueB) < tolerance;
	}
}