The first image in the gallery above shows the MSG effect, the second shows the effect output as an EPS file and zoomed into using Apple’s Preview application to show that when the effect is output as a vector file it can be scaled up without aliasing effects since all of the information in the effect is composed or resolution independent vectors. The third image shows a similar 600% magnification of the original raster effect, note how different it looks when compared to the vector magnification in the 2nd gallery image.
The paint action sequence (PASeq) shown below was used to generate the vector Hilbert space filling curve adaptive halftoning effect. Note that there are 2 action steps in the PASeq. The first is the HCH4 MSG preset available for download here, that was used in the post from 2 days ago.