How do I properly create a BufferedImage from file?

Question

I have this code:

package test;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.WindowConstants;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class SwingSandbox {

    public static void main(String[] args) throws IOException {
        JFrame frame = buildFrame();

        final BufferedImage image = ImageIO.read(new File("C:\\Projects\\Test\\src\\test\\InterestCalcGraphic.jpg"));

        JPanel pane = new JPanel() {
            @Override
            protected void paintComponent(Graphics g) {
                super.paintComponent(g);
                g.drawImage(image, 0, 0, null);
            }
        };


        frame.add(pane);
    }


    private static JFrame buildFrame() {
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setSize(200, 200);
        frame.setVisible(true);
        return frame;
    }


}

When I run it, I get this error message:

    Exception in thread "main" javax.imageio.IIOException: Can't read input file!
    at javax.imageio.ImageIO.read(ImageIO.java:1301)
    at test.SwingSandbox.main(SwingSandbox.java:17)

The error message leads me to believe that my file path is incorrect, but the image is stored under Test - src - test in my file directory. What am I doing wrong?

Possible duplicate of http://stackoverflow.com/questions/5713096/javax-imageio-iioexception-for-apparently-no-reason — Raghu K Nair, Feb 25 '16 at 20:57
The image can't be read for some reason, maybe it doesn't exist or is not a supported image format — MadProgrammer, Feb 25 '16 at 20:58
It exists, because it shows up in the file directory, and how could jpgs not be supported? — Ethan JC Rubik, Feb 25 '16 at 20:59
don't do everything in one line. try: File myFile = new File ("C:\......e); String myFilePath = myFile.getAbsolutePath(); System.out.println ("myFilePath = " + myFilePath); Also see what the method File.canRead() gives you. And if all that works then try ImageIO.read — ssimm, Feb 25 '16 at 21:10
Attach your image, please. It's either the path that is incorrect, or the image is unreadable. — Harald K, Feb 25 '16 at 21:19
I can't attach any images to stackoverflow, because my computer screen isn't big enough to fir the entire add image popup. — Ethan JC Rubik, Feb 25 '16 at 21:21
Try using `ImageIO.read(getClass().getResource("new "/test/InterestCalcGraphic.jpg"));`, never, ever, use a path reference which includes `src`, these files won't exist when the program is packaged. — MadProgrammer, Feb 25 '16 at 21:51
and why am I able to reaed this?? try { bim=ImageIO.read(new File("c:/vision/src/yel.png")); } - that "never, ever" is on the dumpsters then — gpasch, Feb 25 '16 at 22:06

score 1 · Answer 1 · answered Feb 25 '16 at 21:14

1

ImageIO hasn't even tried to load your image file. Something is wrong with your file itself. E.g. your path is incorrect. Try to call this

File f = new File("C:\\Projects\\Test\\src\\test\\InterestCalcGraphic.jpg");
boolean value = f.canRead();

What is boolean value of value variable? If it false check your image file path, file name typo etc.

answered Feb 25 '16 at 21:14

Andriy Kryvtsun

3,220
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It is false, but I can't figure out why. My file path seems to be correct. – Ethan JC Rubik Feb 25 '16 at 21:18
`at javax.imageio.ImageIO.read(ImageIO.java:1301)` seems to suggest otherwise – MadProgrammer Feb 25 '16 at 21:30
Try a different image. Also try using forward slashes. I think that works in java. C:/Projects/Test/... – ssimm Feb 25 '16 at 21:44
And try a shorter path, like an image sitting in C:/Projects – ssimm Feb 25 '16 at 21:45
@EthanJCRubik let's do this step-by-step: 1. move your image file into `C:\\Projects` as you already suggested. Try after this my 2 lines of code. 2. if problem isn't in the path try rename you image to e.g. `a.jpg` and try my 2 lines of code again. 3. let us know :) – Andriy Kryvtsun Feb 25 '16 at 21:52
I can't move an image file into projects, the best I can do is move it into projects/test. – Ethan JC Rubik Feb 25 '16 at 21:59
It returns false, even when I do this: – Ethan JC Rubik Feb 25 '16 at 22:01
`File f = new File("C:\\Projects\\Test\\a.jpg"); boolean value = f.canRead(); System.out.println(value);` – Ethan JC Rubik Feb 25 '16 at 22:01
@EthanJCRubik try to move `a.jpg` into `C:\\Projects` or in any another folder. It's only for your troubleshooting for getting `value == true`. Later, after full problem understanding, we'll think how fix it (locate your picture) better. BTW can you share somehow your code? E.g. at GitHub? – Andriy Kryvtsun Feb 25 '16 at 22:07
My mouse turns into a little x symbol when I try to drag the file into projects. I literally can't do it. I can only share my code on stackoverflow. – Ethan JC Rubik Feb 25 '16 at 22:10
I finally got it to return true by creating a new folder called graphics, and then doing this: `File f = new File("graphics/a.jpg"); boolean value = f.canRead(); System.out.println(value);` – Ethan JC Rubik Feb 25 '16 at 22:20
But here's the problem: now that I have the image stored as a bufferedImage, it still isn't showing up on my JPane. – Ethan JC Rubik Feb 25 '16 at 22:21
"How do I properly create a BufferedImage from file?" that s your answer dude; give the points and move on – gpasch Feb 25 '16 at 22:25
Nevermind, I just hadn't scaled the image properly. Thanks for all your help! (I would vote up your answer, but I just lost 2 reputation for this question being downvoted, and I can't upvote anymore.) – Ethan JC Rubik Feb 25 '16 at 22:25

score 1 · Answer 2 · answered Feb 25 '16 at 22:27

1

I created a folder called graphics, and then used just the folder name in my path, nothing else. Like this:

final BufferedImage image = ImageIO.read(new File("graphics/a.jpg"));

answered Feb 25 '16 at 22:27

Ethan JC Rubik

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score 0 · Answer 3 · answered Sep 30 '17 at 18:39

0

I think you want to read the file from the classpath instead.

final BufferedImage defaultImage =
    ImageIO.read(
        this.getClass().getResourceAsStream("/graphics/file.png"));

Place the file in src/main/resource/graphics. (for maven defaults)

answered Sep 30 '17 at 18:39

KarlP

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How do I properly create a BufferedImage from file?

3 Answers3