The Text (iTXt) chunk contains keyword/value metadata about the PNG stream. The metadata in this chunk can be encoded using UTF-8 characters. Moreover, it is possible to define the language of the metadata, and give a translation of the keyword name. Finally, it supports bot compressed and uncompressed values.
@todo This chunk is currently not implemented, but merely read and written
back intact.
@see ChunkyPNG::Chunk::Text @see ChunkyPNG::Chunk::CompressedText
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