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Why would an 8 bit raster create an image cache service twice the size of a 16 bit?

Question asked by K_Crawford on Jul 19, 2019
Latest reply on Jul 19, 2019 by Dan_Patterson

While creating a cached image service I noticed that the estimate cache size was more than double a previously created cache. The only difference was the smaller image cache was created on a 16 bit raster vs the new image service would be using an 8 bit raster. Can anyone explain why or what would cause this massive difference in cache size (30 GB vs 80 GB)?