Question

Is it possible to generate a new image name for each image that is processed using the following code (I have highlighted the relevant section)?

public static void makeBinary(File image) { 
try{
    //Read in original image. 
    BufferedImage inputImg = ImageIO.read(image);

    //Obtain width and height of image.
    double image_width = inputImg.getWidth();
    double image_height = inputImg.getHeight();

    //New images to draw to.
    BufferedImage bimg = null;
    BufferedImage img = inputImg;

    //Draw the new image.      
    bimg = new BufferedImage((int)image_width, (int)image_height, BufferedImage.TYPE_BYTE_BINARY);
    Graphics2D gg = bimg.createGraphics();
    gg.drawImage(img, 0, 0, img.getWidth(null), img.getHeight(null), null);


// ************* THIS IS WHERE I AM HAVING DIFFICULTY ***************

    //Save new binary (output) image.   
    String temp = "_inverted";
    File fi = new File("images\\" + temp + ".jpg");
    ImageIO.write(bimg, "jpg", fi);

// ******************************************************************


}
 catch (Exception e){
    System.out.println(e);
 }
}

I have 300 images, numbered 001.jpg – 300.jpg, and what I would like is for each new outputted image to be named something along the lines of, binary_001.jpg – binary_300.jpg.

The method that calls makeBinary() is located in another class and is:

public static void listFiles() {

    File dir = new File("images");
    File imgList[] = dir.listFiles();

    if(dir.isDirectory()){
        for(File img : imgList){
            if(img.isFile()){
                MakeBinary.makeBinary(img);
                System.out.println(img + ": processed successfully.");
            }
            else{
                System.out.println("Directory detected; skipping to next file,");
            }
        }
    }
}

How can I go about achieving this?

Many thanks.

Answer 1

Get the filename from your File image parameter and add it to the new filename:

String temp = image.getName() + "_inverted";
File fi = new File("images\\" + temp + ".jpg");
ImageIO.write(bimg, "jpg", fi);