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Why am I getting a smaller jpg image size when converting from File->BufferedImage->byte[]

General Tech Bugs & Fixes

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( 6 months ago )


I'm testing different ways to store a jpg file in java and using a ByteArrayInputStream from a buffered image always results in a smaller file size. Is there anyway around this?

So for the whole picture, I'm currently trying to write a client-server image storing program(with eventual editing capabilities, think adobe lightroom). Uploading to the server from the client is no problem, just use Files.readAllBytes(currentFile.toPath()); and vice-versa when downloading to the client from the server, since it's being stored as a file.

The problem is what to do when I want to upload the same image I received(Assuming the image is edited and wanted to be reuploaded to server). I don't have a file created from it so I can't use the readAllBytes functions, they're only stored as an Image Object or BufferedImage. When I write that to a ByteArrayInputStream and get the size of the byte[] array to send back to the server, it's always smaller than the originals.

As a last resort I can make this into an export option so you have to download an image from the server onto the computer before editing, but it would make workflow less efficient.

currentFile = fileChooser.showOpenDialog(window);

            currentImage = new Image(currentFile.toURI().toString());

            System.out.println("Original file length "+currentFile.length());

                try {
                    BufferedImage bImage =;

                    byte[] fileContent = Files.readAllBytes(currentFile.toPath());
                    System.out.println("bytes from fileContent " +fileContent.length);

                    ByteArrayOutputStream tmp = new ByteArrayOutputStream();
                    ImageIO.write(bImage, "jpg", tmp);
                    byte[] imageBytes = tmp.toByteArray();
                    long length = imageBytes.length;

                    System.out.println("length of bytearraystream " + length);

Printed Results:
Original file length 196874
bytes from fileContent 196874
length of bytearraystream 117010

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