Compressing Limited Colour PNG images

Most of the .PNG files on this site are the ‘blueprint’ style diagrams, like this one:

Blueprint style diagram showing an optical microscope. The sample inside is magnified in a bubble to 2,500 times, showing it to be a complex, detailed paisley pattern.

This illustration is a large 5.6MB SVG file, mostly because of the very detailed paisley pattern that I used.

Exported to PNG - and then compressed using the process below, you can get this down to 118.5kB.

I create these in Inkscape as vector .SVG files & export them to bitmap .PNG files. I then re-compress them, to ensure ...

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