Added the Image to UTF algorithm for Java

Image to UTF/Description.txt

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+The algorithm must be able to transfer an image, such as a .png or base64 image and transform it into a grid with utf characters as pixels.

Image to UTF/ImageToUTF.java

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+package com.tek.ascii.lib;
+
+import java.awt.Color;
+import java.awt.Graphics2D;
+import java.awt.image.BufferedImage;
+import java.util.HashMap;
+
+/*
+ * UTFLib.class by RedstoneTek
+ * Utility class to perform a bunch
+ * of different utf/image operations
+ */
+
+public class ImageToUTF {
+
+	public static HashMap<Character, Integer> brightnessTable = new HashMap<Character, Integer>();
+
+	public static String toUtf(BufferedImage image, int outX, int outY) {
+		if(image == null || outX == 0 || outY == 0 || outX < 0 || outY < 0) return null;
+
+		int inX = image.getWidth();
+		int inY = image.getHeight();
+
+		if(outX > inX || outY > inY) return null;
+
+		int raX = inX / outX;
+		int raY = inY / outY;
+
+		StringBuilder builder = new StringBuilder();
+
+		for(int y = 0; y < inY; y += raY) {
+			for(int x = 0; x < inX; x += raX) {
+				int areaBrightness = 0;
+				int i = 0;
+
+				for(int px = x - raX; px < x; px++) {
+					for(int py = y - raY; py < y; py++) {
+						int clr   = image.getRGB(x,y); 
+						int red   = (clr & 0x00ff0000) >> 16;
+						int green = (clr & 0x0000ff00) >> 8;
+						int blue  = (clr & 0x000000ff);
+
+						Color color = new Color(red, green, blue);
+
+						areaBrightness += brightness(color);
+
+						i++;
+					}
+				}
+
+				areaBrightness /= i;
+
+				char processed;
+
+				processed = cbrightness(areaBrightness);
+
+				if(processed == (char)999) {
+					processed = ArtChar.charFrom(areaBrightness);
+				}
+
+				builder.append(processed);
+			}
+
+			builder.append(System.lineSeparator());
+		}
+
+		return builder.toString().substring(0, builder.toString().length() - System.lineSeparator().length());
+	}
+
+	public static void loadBrightnessTable() {
+		int highest = 0;
+
+		for(int i = 33; i <= 254; i++) {
+			char c = (char)i;
+
+			BufferedImage bimage = new BufferedImage(16, 16,
+				    BufferedImage.TYPE_BYTE_INDEXED);
+
+			Graphics2D g2d = bimage.createGraphics();
+
+			g2d.setColor(Color.WHITE);
+			g2d.fillRect(0, 0, bimage.getWidth(), bimage.getHeight());
+
+			g2d.setColor(Color.BLACK);
+			g2d.drawString("" + c, 0, 16);
+
+		    g2d.dispose();
+
+		    int brightnessArea = 0;
+		    int iter = 0;
+
+		    for(int x = 0; x < bimage.getWidth(); x++) {
+		    	for(int y = 0; y < bimage.getHeight(); y++) {
+		    		int clr   = bimage.getRGB(x,y); 
+					int red   = (clr & 0x00ff0000) >> 16;
+					int green = (clr & 0x0000ff00) >> 8;
+					int blue  = (clr & 0x000000ff);
+
+					Color ci = new Color(red, green, blue);
+
+					brightnessArea += brightness(ci);
+
+		    		iter++;
+		    	}
+		    }
+
+		    brightnessArea /= iter;
+
+		    if(brightnessArea > highest) highest = brightnessArea;
+
+		    brightnessTable.put(c, brightnessArea);
+		}
+
+		for(char c : brightnessTable.keySet()) {
+			double bn = brightnessTable.get(c);
+			bn = 255 - (bn / highest * 255);
+			brightnessTable.put(c, (int)bn);
+		}
+	}
+
+	public static char cbrightness(int brightness) {
+		for(char c : brightnessTable.keySet()) {
+			if(brightnessTable.get(c).equals(brightness)) return c;
+		}
+
+		return (char)999;
+	}
+
+	public static int brightness(Color c)
+	{
+	   return (int)Math.sqrt(
+	      c.getRed() * c.getRed() * .241 + 
+	      c.getGreen() * c.getGreen() * .691 + 
+	      c.getBlue() * c.getBlue() * .068);
+	}
+
+	public enum ArtChar{
+		a(0, 40, '#'),
+		b(41, 80, 'O'),
+		c(81, 120, 'C'),
+		d(121, 160, '/'),
+		e(161, 200, '~'),
+		f(201, 240, ','),
+		g(241, 255, '.');
+
+		public int from, to;
+		public char ch;
+
+		ArtChar(int from, int to, char ch){
+			this.from = from;
+			this.to = to;
+			this.ch = ch;
+		}
+
+		public static char charFrom(int brightness) {
+			for(ArtChar ac : ArtChar.values()) {
+				if(brightness >= ac.from && brightness <= ac.to) return ac.ch;
+			}
+
+			return ' ';
+		}
+	}
+
+}