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Lossless Compression algorithm


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I can not for the life of me remember what the algorithm is called and https://en.wikipedia.org/wiki/Lossless_compression has so many types not sure which is the one I was looking for.
What's the "best" method for compressing an array of any length with values between 0,255? 
I used one in the past and it had a look up table I think and was like an array with a bunch of other arrays inside of it.  It was a long time ago so sorry if this is not very descriptive.

End goal is after serialization of a ImageData.data into a smaller/stripped down array is to then hit it with a lossless compression algo before it exports so I can get the Image data I am saving even smaller.

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@Pryme8 Two easy methods for compressing files:

- you can use deflate on webserver: all files arrive with automatic gzip transfer encoding to the browser. just some  .htaccess settings on apache.
- jszip. Easy file access from a zip file. I'm already using this (in my engine I'm working on), not just compression but lower the number of http requests. https://stuk.github.io/jszip/

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