Every PNG image on this blog goes through ImageMagick to create srcset versions, then pngcrush to losslessly optimise them. The savings are routinely upwards of 40% for the same visuals, or 40pc if I go by some bizarre modern style guides.
I was reviewing my dotfile aliases, like a gentleman, and noticed pngcrush had an option I hadn’t noticed before:
-loco ("loco crush" truecolor PNGs)
From the help file:
Make the file more compressible by performing a lossless, reversible, color transformation. The resulting file is a MNG, not a PNG, and should be given the “.mng” file extension. The “loco” option has no effect on grayscale or indexed-color PNG files.
I thought it may have been a neural network trained on locomotives. Trained on locomotives? That was some top-shelf humour.