The Smiling Pony 
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GIFs have a very low colour limit, with some colours achieved via dithering (mixing dots in different colours to achieve an intermediate one). When sizcaled down in resolution, that amount of detail is lost and one set of dots survives while others do not, similar to aliasing.
( ͠° ͟ʖ ͡° )
GIFs have a very low colour limit, with some colours achieved via dithering (mixing dots in different colours to achieve an intermediate one). When s