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read an image in java

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amit kumar gupta
read an image in java
1 Answer(s)      6 years and 9 months ago
Posted in : Java Beginners

qns: how we can read an image tell me about its code?

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February 7, 2013 at 12:26 PM


import java.awt.image.*;

import javax.imageio.ImageIO;

import java.io.*;

public class Converter

{

public static void main(String[] args) throws FileNotFoundException, IOException
{
    File output_file=new File("C:/pixels.txt");                   //Output Text file
    PrintStream out=new PrintStream(new FileOutputStream(output_file));
    System.setOut(out);
    BufferedImage image = readImage("C:/Untitled.jpg");               //Input Image file
    printAllARGBDetails(image);
}

public static void printAllARGBDetails(BufferedImage image)
{
    int width = image.getWidth();
    int height = image.getHeight();
    int pix_num=1;
    int total_pix=width*height;
    System.out.println("--------------------------------------------");
    System.out.println("Image Scrambler");   
    System.out.println("Image Dimension: Height-" + height + ", Width-" + width);
    System.out.println("Total Pixels: " + (height * width));
    System.out.println("--------------------------------------------");
    for (int i = 0; i < width; i++)
    {
        for (int j = 0; j < height; j++)
        {
            int pixel = image.getRGB(i, j);
            String idata=(getARGBPixelData(pixel));
            System.out.print("Pixel ("+i+","+j+"): ");
            System.out.print(idata);
            if(pix_num<total_pix)      
            {
                System.out.println("");
            }
            pix_num++;
        }
    }
}

public static String getARGBPixelData(int pixel)
{
    String ARGBvalue="";
    int alpha = (pixel >> 24) & 0x000000FF;
    int red = (pixel >> 16) & 0x000000FF;
    int green = (pixel >>8 ) & 0x000000FF;
    int blue = (pixel) & 0x000000FF;
    ARGBvalue = alpha + " " + red + " " + green + " " + blue;
    return ARGBvalue;
}

public static BufferedImage readImage(String fileLocation) throws IOException
{
    BufferedImage img = null;
    img = ImageIO.read(new File(fileLocation));
    return img;
}

}


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