add negati

image-project/Negativ.java

@@ -0,0 +1,60 @@
+import java.awt.Color;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import javax.imageio.ImageIO;
+
+public class Negativ {
+
+    public static void main(String [] args) {
+
+        String outFormat = "png";
+        File inputPath = new File("img/Taj_Mahal4.png");
+        File outputPath = new File("img/Taj_Mahal4_grau.png");
+
+        BufferedImage original_image = null;
+
+        try {
+            original_image = ImageIO.read(inputPath);
+            System.out.println("Reading " + inputPath + " complete !"); }
+        catch (IOException e) {
+            System.out.println("Error: " + e);
+        }
+
+        int width =  original_image.getWidth();
+        int height =  original_image.getHeight();
+
+        System.out.println("\n" + "width = " + width + " height = " +
+                           height + "\n");
+
+        BufferedImage newImage = new BufferedImage(width, height,
+                                         BufferedImage.TYPE_INT_ARGB); 
+        newImage.createGraphics().drawImage(original_image, 0, 0, null);
+
+    
+        int p, new_p, a, r, g, b;
+
+        for (int y = 0; y < height; y++) {
+            for (int x = 0; x < width; x++) {
+                p = original_image.getRGB(x, y);
+
+                a = (p >> 24) & 0xFF; r = (p >> 16) & 0xFF;
+                g = (p >> 8) & 0xFF; b = p & 0xFF;
+
+                new_p = (a << 24) | (255 - r << 16) | (255 - g << 8) | 255 - b;
+
+                newImage.setRGB(x, y, new_p);
+            }
+        }
+
+        try {
+            ImageIO.write(newImage, outFormat, outputPath);
+            System.out.println("Writing " + outputPath + " complete !"); }
+        catch(IOException e) {
+            System.out.println("Error: " + e); 
+            System.exit(1);
+        }
+
+        System.exit(0);
+    }
+}