.. index:: PNG (Portable Network Graphics) .. index:: .png PNG (Portable Network Graphics) =============================================================================== Extensions: .png Developer: `PNG Development Group `_ **Support** BSD-licensed: |yes| Export: |yes| Officially Supported Versions: Reader: APNGReader (:bsd-reader:`Source Code `, :doc:`Supported Metadata Fields `) Writer: APNGWriter (:bsd-writer:`Source Code `) Freely Available Software: - `PNG Writer plugin for ImageJ `_ We currently have: * a `PNG specification document `_ (W3C/ISO/IEC version, from 2003 November 10, in HTML) * several PNG datasets We would like to have: **Ratings** Pixels: |Very good| Metadata: |Very good| Openness: |Outstanding| Presence: |Outstanding| Utility: |Poor| **Additional Information** Bio-Formats uses the `Java Image I/O `_ API to read and write PNG files. .. seealso:: `PNG technical overview `_