I want to compress(reduce) image size using Java. We can upload images in jpg/jpeg/png formats. The general format of images is PNG. So, after image uploaded to the server, we need to compress(reduce file size) and convert it to PNG.
I have the next code for the compress image:
BufferedImage bufferedImage = ImageIO.read(inputStream);
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
switch (imageType) {
case PNG:
case JPG:
// need Java 9+ for PNG writer support
ImageWriter writer = ImageIO.getImageWritersByFormatName(imageType.getExtension()).next();
ImageOutputStream ios = ImageIO.createImageOutputStream(outputStream);
writer.setOutput(ios);
ImageWriteParam param = writer.getDefaultWriteParam();
if (param.canWriteCompressed()) {
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
param.setCompressionQuality(0.3f);
}
writer.write(null, new IIOImage(bufferedImage, null, null), param);
writer.dispose();
return new ByteArrayInputStream(outputStream.toByteArray());
default:
log.warn("Image type unknown");
return null;
}
The problem is - after processing the image, I got the result - file size increased instead of reducing. The original image has a lower size than compressed. Any suggestions on how to solve this issue?
As a solution for this problem I can recommend the API of TinyPNG.
You can use it for compressing as well as resizing the image.
It works for both .jpeg and .png.
Documentation: tinypng.com/developers/reference/java
Unfortunately the lossy JPEG compression compresses far better than the lossless PNG compression. You could restrict width and height of the image and scale proportionally.
So I would switch to JPEG and restrict the size.
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