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SaveImage(#MyImage, sMyFile, #PB_ImagePlugin_PNG | #PB_AntiAlias)

What would it do exactly?

Usually antialiasing makes sense with computer generated geometry, from a working higher resolution to a targeted lower one (supersampling), or in a more ample sense when you want an image to be merged with a background and want its borders to be filtered in some way against the adjacent pixels (not really antialiasing though).
But I don't see what can be done with a generic, static bitmap since there is not a rasterization phase involved.

For me, it's to do with graphics dynamically drawn on a CanvasGadget. Since the drawing is dynamic, the AlphaBlend mode cannot be used, though I'm looking at a couple of alternatives, with re-drawing the graphic on mouse-up being a possibility.

I think it is impossible of this stage (saving). IMHO anti-aliasing must happen while drawing because then the geometry is known. On saving a bitmap it can only be some blurring which will reduce sharpness but not a real anti-aliasing.

Am I wrong?

Kukulkan

I don't believe SaveImage() is the appropriate stage for it, however if you're saving as 8bit you could see what the #PB_Image_FloydSteinberg flag does for you, it may help quite a bit.