import java.io.File; import java.io.IOException; import java.awt.image.BufferedImage; import javax.imageio.ImageIO; import java.util.Scanner; public class Blacknwhite{ public static void main(String args[])throws IOException{ BufferedImage img = null; File f = null; //read image try{ f = new File("C:\\Users\\student\\Pictures\\Koala.jpg"); img = ImageIO.read(f); }catch(IOException e){ System.out.println(e); } //get image width and height int width = img.getWidth(); int height = img.getHeight(); int r1=0,b1=0,g1=0; int a=0,b=0,g=0,r=0; //convert to negative System.out.println("\n Enter the Image Component given below: \n 1. Red \n 2. Green \n 3. Blue \n 4. Cyan \n 5. Magenta \n 6. Yellow "); System.out.println("\n Enter your choice:"); Scanner in = new Scanner(System.in); int ch = in.nextInt(); for(int y = 0; y < height; y++){ for(int x = 0; x < width; x++){ int p = img.getRGB(x,y); a = (p>>24)&0xff; r = (p>>16)&0xff; g = (p>>8)&0xff; b = p&0xff; //subtract RGB from 255 int newRed =(int) (0.393*r + 0.769*g + 0.189*b); int newGreen =(int) (0.349*r + 0.696*g + 0.168*b); int newBlue = (int) (0.272*r + 0.534*g + 0.131*b); //set new RGB value if(newRed>255) r=255; else r=newRed; if(newGreen>255) g=255; else g=newGreen; if(newBlue>255) b=255; else b=newBlue; if(ch==1) { p = (a<<24) | (r<<16) | (0<<8) | 0; } else if(ch==2) { p = (a<<24) | (0<<16) | (g<<8) | 0; } else if(ch==3) { p = (a<<24) | (0<<16) | (0<<8) | b; } else if(ch==4) { p = (a<<24) | (0<<16) | (g<<8) | b; } else if(ch==5) { p = (a<<24) | (r<<16) | (0<<8) | b; } else if(ch==6) { p = (a<<24) | (r<<16) | (g<<8) | 0; } img.setRGB(x, y, p); } } //write image try{ f = new File("C:\\Users\\student\\Pictures\\yellow2.jpg"); ImageIO.write(img, "jpg", f); }catch(IOException e){ System.out.println(e); } }//main() ends here }//class ends here

image processing