Engineeringserver.com | Get the rgb value of an image in java

Get the rgb value of an image in java

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10.28.2008 by HappyFace in uncategorized

An example application i wrote that displays the rgb value of the current selected pixel. The demo doesn't have a gui and works from the command line. The image file is static but it can be changed easily.

PLAIN TEXT

JAVA:

import javax.imageio.ImageIO;
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Scanner;
// I rewrote it from a tutorial here: http://www.rgagnon.com/javadetails/java-0257.html
// Ark - www.engineeringserver.com , the application shows the RGB value from an X,Y coordinate of an image
// this version reads the user input for the X Y coordinates and shows the width and height of the image.
public class PixelColor {
public static void main(String[] args) {
PixelColor PC = new PixelColor();
PC.getImageInfo();
}
public void getImageInfo(){
File file = new File("c:\\tmp.bmp");
BufferedImage image;
try {
Scanner sc = new Scanner(System.in);
System.out.print("Get X,Y coordinate a from image: " );
String[] xY = sc.nextLine().split("\\,");
int x = Integer.parseInt(xY[0]);
int y = Integer.parseInt(xY[1]);
image = ImageIO.read(file);
int c = image.getRGB(x,y);
int red = (c & 0x00ff0000)>> 16;
int green = (c & 0x0000ff00)>> 8;
int blue = c & 0x000000ff;
Color c1 = new Color(red,green,blue);
System.out.println("Pixel value at X:"+ x + " Y:" + y);
System.out.println("R:" +c1.getRed() + " G:" + c1.getGreen() + " B:"+ c1.getBlue());
System.out.println("Width of Image:" + image.getWidth() + " Height of Image:" + image.getHeight());
} catch (NumberFormatException NFE) {
System.out.println("\nYour input doesn't match.. example: 15,20");
System.out.println("");
PixelColor PC = new PixelColor();
PC.getImageInfo();
} catch (IOException e) {
System.out.println("\nNo image available to read.");
PixelColor PC = new PixelColor();
PC.getImageInfo();
}
catch(ArrayIndexOutOfBoundsException AIOOBE){
System.out.println("\nx/y value is larger than the image size");
PixelColor PC = new PixelColor();
PC.getImageInfo();
}
}
}