overviewer/Minecraft-Overviewer — pull request #1098 by CounterPillow (2014-05-08 19:06:30+00:00)
Title: Clarify optimizeimg docs; Warn if the order of optimizers does not make sense.

The validator will now warn if it detects that a crushed output is fed into something that is not a crusher.

The is_crusher method of an optimizer shall return True if the optimisation process is lossless, and does try to find optimal encoding parameters as opposed to only removing unneeded channels or reducing palettes.