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How can I access/remove PNG metadata?
I'm looking for a Mac application or a PHP snippet.
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Textual information chunks - the metadata in PNGThe iTXt, tEXt, and zTXt chunks (text chunks) are used for conveying textual information associated with the image. They are the places we can find all metadata of PNG file.
PNG has no EXIF chunk. Thus EXIF metadata will get lost if you convert from JPEG into PNG. However Adobe has made XMP for storing all kinds of metadata. So that you can convert between JPEG and PNG while preserving metadata.
Sorry to post a Windows software, but if you don't find anything good for MAC, there's TweakPNG, which is by far the best PNG disassembler I've seen.
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PNGCrush can remove metadata as well as optimize/recompress the bitmap images.
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