PeachDrawing
PeachDrawing.RasterCanvas
RasterCanvas.PrefersRasterGroups Property
Whether group effects (opacity, blend modes, colour functions) are best done by rendering the element into a tight bitmap and compositing that, rather than through CreateTile(double, double). True for a raster graphics, whose tile would otherwise span from the page origin; false for a PDF graphics, where a tile is a cheap vector Form XObject.
public override bool PrefersRasterGroups { get; }