Java PNG Writer

The JDeli Java image library includes a PNG Writer to write PNG files in Java. The PNG Encoder is written in 100% Java and provides PNG support with no dependencies.

Key information:

• 100% Java solution. No dlls or dependencies on native code
• Relatively faster compression
• PngQuantization: Supports 8-bit Compression which reduces the size of any PNG file by indexing colours

Quick start or to replace in existing code using ImageIO:

JDeli.write(myBufferedImage, "png", outputStreamOrFile);

or

byte[] outputData = JDeli.write(myBufferedImage, "png");

New method for quick and simple usage

JDeli.write(myBufferedImage, OutputFormat.PNG, outputStreamOrFile)

OutputFormat allows setting of any supported Image Format

For complete control of output:

final PngEncoderOptions options = new PngEncoderOptions();

//set any options in options instance - examples below
options.setCompressionFormat(PngCompressionFormat.QUANTISED8BIT);
options.setCompressionFormat(PngCompressionFormat.NONE);

//write out
JDeli.write(myBufferedImage, options, outputStreamOrFile);

PngEncoderOptions allows setting of specific options.

Various image processing operations can be conducted on the image, detailed documentation can be found here.

Performance comparisons:

These figures were generated using jmh (as documented on our blog) with a standard set of images (also documented). They should be easy to replicate if you wish to validate, the code is on GitHub.

The higher the number, the better.

Mode: Throughput Count: 25 Units: ops/s

Number of files: 166

Tested on 2020 13inch M1 MacBook Pro using JDK 18.0.1.1