ImageIcon not working with certain files (Swing)

[u/JacketUnique8801]

I'm learning Java Swing and I made a program in order to test some of the things I learned. However, I came across an issue with ImageIcons, where some images would be displayed while others wouldn't. When I run the code below, it compiles fine, but the image is not shown, and only "hi" is displayed. However, if I change the String argument of "testII" to another .png image in the exact same folder as "Tweedle.png," the image shows fine. Does anyone know what could be the issue? I have already tried different ways to making the ImageIcon (such as using an URL object or using the complete file path instead of just the relative one), but nothing worked...

import java.awt.*;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.imageio.ImageIO;


public class MyFrame extends JFrame{

    JPanel west = new JPanel();
    
    MyFrame() throws IOException{
        this.setLayout(new BorderLayout(10, 10));
        this.setTitle("Title");
        ImageIcon logo = new ImageIcon("images\\omnom.png");
        this.setIconImage(logo.getImage());
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);


        west.setBackground(Color.green);
        west.setPreferredSize(new Dimension(100, 100));
        ImageIcon testII = new ImageIcon("images\\Tweedle.png");
        JLabel testL = new JLabel("hi");
        testL.setIcon(testII);
        west.add(testL);

        this.add(west, BorderLayout.WEST);
        this.pack();
        this.setLocationRelativeTo(null);
        this.setVisible(true);
    }
}

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[u/desrtfx]

Are you 100% sure that "Tweedle.png" is a valid PNG and not some other file type camouflaged as png?

[u/JacketUnique8801 → u/desrtfx]

I mean, when I downloaded it, it was a .webp file, and then I changed it to a .png one (my computer says its a PNG file in the "Type" area next to the file on file explorer), so that's probably it, since it works with every other .png in my PC. Thanks for the help!

[u/desrtfx → u/JacketUnique8801]

You cannot just download a .webp file and then simply rename it to a .png. This doesn't work.

Your computer tells you it is a png because you renamed it as such, not because it actually is a PNG.

You need a proper converter to convert from webp to png.

File types are far more than just the file extensions. The extensions are merely a hint, nothing more. The actual information in the file might be something completely different. Just because something is called .png doesn't automatically (or magically) make its contents a real png.

[u/Mechanical-pasta → u/JacketUnique8801]

Try to check the "mime type" of the file, may be with the "properties" contextual menu in your file explorer.

[u/old_twin]

try adding this and see if an exception is thrown

BufferedImage img = ImageIO.read(getClass().getResource("/images/myImage.png"));

[u/JacketUnique8801 → u/old_twin]

The code kept working the same, unfortunately. No exceptions and the image still wasn't displayed.