Optimise image data about emoji-data HOT 6 CLOSED

This repo provides the images in their original high quality. Quantizing the sheets causes a significant degradation in image quality; they just use too many colors to be reduced to 256 and maintain fidelity. You're welcome to compress the images as much as you find acceptable, but the repo will continue to contain only original quality.

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@iamcal, what’s your opinion on lossless compression, though?

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the sheets are already run through optipng with the highest search factor (takes a few hours for each release), but if you have a reliable/automatable way of compressing them further, i'm interested!

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I’m confident ImageOptim will deliver better results here, as it makes use of several lossless optimization tools like optipng and can be automated. The only downside is that it’s not cross-platform (works only on OS X).

@iamcal, I can integrate this into the pipeline—just let me know if you’re okay with that.

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i don't use a mac; it needs to be automated under linux, sorry

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Issue #49 is for adding an alternative version of the sheets with indexed colors to make them smaller.

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