What software can I use to read png metadata?

Question

I know that I can create a simple little Qt based application that adds and read png metadata, using the QImage.setText(...) and QImage.text(...). That metadata can then be read with a linux command called pngmeta.

But what other image software can I use to read out the png metadata?

Please note that I'm seeking image programs for the common platforms, so please specify if your application is for Windows or Linux.

To make the question clearer I attached a img with some test metadata attached to it.

Thanks Johan

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Links:

• http://en.wikipedia.org/wiki/Portable_Network_Graphics - png
• http://en.wikipedia.org/wiki/Extensible_Metadata_Platform - xmp metadata

Answer 1

Using ImageMagick:

identify -verbose image.png

ImageMagick should be cross-platform. I tried it on Linux with your attached image:

[...]
Properties:
  Author: Hans Müller
  Date: 2010-12-08 09:45
  date:create: 2010-12-08T13:15:43+01:00
  date:modify: 2010-12-08T13:15:43+01:00
  Desc: A long time ago in a galaxy far far away....
  signature: 3b4a54202316a7ae4b4fe0e431d47958181f4bb893493355820d4ba74f9f5ee3
[...]

Answer 2

Another option is TweakPNG, on Windows.

I can see that is having problems displaying the Hans Müller name in your image, so maybe it does not work with Unicode metadata.