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A comment on Building a r/place in a weekend. Parent comment

Re:Building a r/place in a weekend by frakturfreund on Sunday April 16, 2017 @08:15PM (#14128395)
Currently, https://josephg.com/sp/current returns a png with 3x8 (RGB) bits/pixel. But since the image has only 16 colors, you can reduce its filesize to ~20% (from ~714 to ~147 KB, with http://optipng.sourceforge.net/). Can't you can gain performance and reduce bandwith by keeping the image serverside as a 4 bit png?
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Re:Building a r/place in a weekend by josephg on Monday April 17, 2017 @12:01AM (#14129147)
Yes. I wanted to do that, but I couldn't find a png library on npm that supports encoding 4 bit paletted pngs. Fixing that was on my todo list from day 1.

Although now that I think about it, I could probably get close by using an 8bit greyscale image and then apply the palette in the client. That would probably halve the image size.

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Re:Building a r/place in a weekend by Drdrdrq on Monday April 17, 2017 @02:42AM (#14129569)
Cool project! Optipng does many other optimisations but could be taxing on CPU. It should be very easy to put it in the stack for test though.
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