depsypher/pngtastic

A pure Java PNG image optimization and manipulation library

Download

Step 1. Add the JitPack repository to your build file

Add it in your root settings.gradle at the end of repositories:

	dependencyResolutionManagement {
		repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
		repositories {
			mavenCentral()
			maven { url 'https://jitpack.io' }
		}
	}

Add it in your settings.gradle.kts at the end of repositories:

	dependencyResolutionManagement {
		repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
		repositories {
			mavenCentral()
			maven { url = uri("https://jitpack.io") }
		}
	}

Add to pom.xml

	<repositories>
		<repository>
		    <id>jitpack.io</id>
		    <url>https://jitpack.io</url>
		</repository>
	</repositories>

Add it in your build.sbt at the end of resolvers:

 
    resolvers += "jitpack" at "https://jitpack.io"

Add it in your project.clj at the end of repositories:

 
    :repositories [["jitpack" "https://jitpack.io"]]

Step 2. Add the dependency

	dependencies {
		implementation 'com.github.depsypher:pngtastic:pngtastic-1.8'
	}

	dependencies {
		implementation("com.github.depsypher:pngtastic:pngtastic-1.8")
	}

	<dependency>
	    <groupId>com.github.depsypher</groupId>
	    <artifactId>pngtastic</artifactId>
	    <version>pngtastic-1.8</version>
	</dependency>


                            
    libraryDependencies += "com.github.depsypher" % "pngtastic" % "pngtastic-1.8"


                            
    :dependencies [[com.github.depsypher/pngtastic "pngtastic-1.8"]]

Readme

Pngtastic

A pure Java API for dealing with PNG images

Pngtastic is PNG for Java. Just one small jar with no dependencies. It doesn't rely on AWT, so it can be used in restrictive environments like Google App Engine (and probably Android, but haven't tried).

The currently supported operations are:

File size optimization
PNG image layering

Available in Maven

<dependency>
    <groupId>com.github.depsypher</groupId>
    <artifactId>pngtastic</artifactId>
    <version>1.7</version>
</dependency>

New: Support for Zopfli compression!

The latest code adds the ability to optimize png images using the new zopfli deflate compression algorithm. The java port is based heavily on this.

If you're willing to sacrifice compression speed in exchange for ridiculously good compression ratios, you'll want to try using the optional zopfli compressor.

Example usage:

$ mvn install
$ java -cp target/pngtastic-1.8-SNAPSHOT.jar com.googlecode.pngtastic.PngtasticOptimizer --compressor zopfli --iterations 32 --fileSuffix .min.png images/optimizer/amigaball.png

So far I'm seeing better compression ratios for my test images than even the excellent ImageOptim app produces.

Here's a taste (ordered from worst to best compression):

Pngtastic Default Compression
[pngtastic] 59.76% :   169B ->    68B (  101B saved) - build/images/optimizer/1px.png
[pngtastic]  5.99% : 35731B -> 33590B ( 2141B saved) - build/images/optimizer/amigaball.png
[pngtastic]  0.01% :251938B ->251922B (   16B saved) - build/images/optimizer/frymire.png
[pngtastic] 22.37% : 93167B -> 72322B (20845B saved) - build/images/optimizer/gamma.png

ImageOptim Compression
[ImageOptim] 59.8% :   169B ->    73B - build/images/optimizer/1px.png
[ImageOptim]  11.2% : 35731B -> 31729B - build/images/optimizer/amigaball.png
[ImageOptim]  8.7% :251938B ->230055B - build/images/optimizer/frymire.png
[ImageOptim] 28.5% : 93167B -> 66607B - build/images/optimizer/gamma.png

Pngtastic Zopfli Compression
[pngtastic] 61.54% :   169B ->    65B (  104B saved) - build/images/optimizer/1px.png
[pngtastic] 12.21% : 35731B -> 31370B ( 4361B saved) - build/images/optimizer/amigaball.png
[pngtastic] 10.40% :251938B ->225749B (26189B saved) - build/images/optimizer/frymire.png
[pngtastic] 29.27% : 93167B -> 65895B (27272B saved) - build/images/optimizer/gamma.png