Glavo opened a new pull request, #269:
URL: https://github.com/apache/commons-imaging/pull/269

   I hope to support [Extensions to the PNG 1.2 Specification, Version 
1.5.0](http://ftp-osl.osuosl.org/pub/libpng/documents/pngext-1.5.0.html) in 
this PR and be ready to support APNG in subsequent PR.
   
   Some completed work:
   
   * Add an enum representing the PNG extension type;
   * Refactoring `PngImageParser::readChunks` and `ChunkType` to improve 
maintainability makes it easier to add new Chunk types later;
   * Support reading EXIF from PNG images.
   
   Things still need to be done:
   
   * Merge EXIF into PNG metadata;
   * Think about where extensions chunk types should be placed.
   


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