pngtastic | A pure Java PNG image optimization and manipulation library | Compression library

by depsypher Java Version: 1.7 License: MIT

X-Ray Key Features Code Snippets Community Discussions(1)Vulnerabilities Install Support

kandi X-RAY | pngtastic Summary

pngtastic is a Java library typically used in Utilities, Compression applications. pngtastic has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has low support. You can download it from GitHub, Maven.

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

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Quality

Security

License

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Support

pngtastic has a low active ecosystem.

It has 161 star(s) with 32 fork(s). There are 19 watchers for this library.

It had no major release in the last 12 months.

There are 6 open issues and 10 have been closed. On average issues are closed in 43 days. There are 2 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of pngtastic is 1.7

Quality

pngtastic has 0 bugs and 0 code smells.

Security

pngtastic has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

pngtastic code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

pngtastic is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

pngtastic releases are not available. You will need to build from source code and install.

Deployable package is available in Maven.

Build file is available. You can build the component from source.

Installation instructions are not available. Examples and code snippets are available.

pngtastic saves you 2406 person hours of effort in developing the same functionality from scratch.

It has 5702 lines of code, 339 functions and 46 files.

It has high code complexity. Code complexity directly impacts maintainability of the code.

Top functions reviewed by kandi - BETA

kandi has reviewed pngtastic and discovered the below as its top functions. This is intended to give you an instant insight into pngtastic implemented functionality, and help decide if they suit your requirements.

Main method for testing
Compress a single file
Read a buffer of bytes into a byte array
Create a new png image
Process the head chunk
Perform the base and layering
Encodes the given raw byte buffer into the given output buffer
Encodes the given ByteBuffer to the given character buffer
De - filter input
Returns the probability of the pth line
Decode the given data to a file
Encode data to a file
Closes this output stream
Decodes a binary file into a file
Encodes a file into a base64 string
Compares two pixels
Deleting image
Cache the distance symbols
Prepare and return an array of DistCacheExtra bits
Insert the given chunk into the image
Flushes the compressed stream
Applies filters to the image
Main entry point for testing purposes
Main entry point
Counts the number of pixels in the image
Entry point for the program

Get all kandi verified functions for this library.

pngtastic Key Features

No Key Features are available at this moment for pngtastic.

pngtastic Examples and Code Snippets

No Code Snippets are available at this moment for pngtastic.

Community Discussions

Trending Discussions on pngtastic

PNG format images do not display on Mac Safari

QUESTION

PNG format images do not display on Mac Safari

Asked 2018-Jan-10 at 00:44

Images from our website do not display in Safari for some Mac users and they report seeing either no image or a black image. Here is an example:

http://s3-eu-west-2.amazonaws.com/bp18.boxcleverpress.com/Boxclever_logo_chartreuse.png

What I have discovered is:

Images display on PC
Images display on SOME Macs (I have an older one that is OK)
Images display on iPhones and iPads
Images are PNG
I have optimised the images with pngtastic
When images are copied to the Mac and opened with Adobe Photoshop they give the error: the file format module cannot parse the file
When I tried to open a pngtastic optimised file in Photoshop Elements on Windows I also get that error
When I tried to open the optimised file in Photoshop on Windows I get the error IDAT: incorrect data check

I will replace the optimised images with unoptimised ones but I am not sure if this problem is with pngtastic or Adobe image libraries or something else.

...

ANSWER

Answered 2018-Jan-09 at 11:31

The problem appears to be due to the use of the zopfli compression in the PNGs that I optimised using pngtastic. The workaround is to use a different pngtastic compression option and the PNGs are then readable in Photoshop.

Using a different compression algorithm will result in less optimisation.

I am not sure why the zopfli compression is a problem, it could be that there is a fault in my code (although the same code works fine when only the zopli option is changed), in pngtastic, or that MacOS and Adobe don't support zopfli.

@usr2564301 has done some investigation and it appears the Adler-32 checksum on the compressed data in my example image is incorrect. usr2564301 has also tested the pngtastic code and found it to produce the correct checksum. The problem might be in how I handle the bytestream out of pngtastic.

The code below performs the PNG optimisation using pngtastic (com.googlecode.pngtastic.core)

Source https://stackoverflow.com/questions/43526442

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install pngtastic

You can download it from GitHub, Maven.
You can use pngtastic like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the pngtastic component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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