The tIME chunk is for another legacy purpose: we have users who have been using this as the creation date/time, so we need to support it. Unfortunately, the bigger problem right now is speed: although the compression ratio is much better than the standard .NET PNG encoder, the speed is nowhere near what we need (something on the order of 0.7sec to save each PNG file, where the .NET encoder seems to be almost instant). Sigh. I was hoping this would be the easy answer to better compression for my project.
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