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I'm trying to write PNG file with metadata using a custom Filetype Plugin, and I'm just completely blocked.  I just cannot figure out any way to read/write PNG metadata within C#.  I've tried PngBitmapDecoder examples I've found, but the examples don't work at all.  I've also tried PNGCS library and that doesn't seem to work either.


Does anyone have any ideas on how to write metadata to a PNG file?

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Just as an aside: I think you're going to need to use a custom extension when saving.  Otherwise the native PNG format is always going  to overwrite your filetype.  See how the Animated GIF/PNG plugin uses *.AGIF and *.APNG respectively to avoid this issue.

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