\caption{Compositing checks using original artwork, with no measured data. (a) A palette PNG with transparent, partially transparent and opaque entries over blue and orange vector blocks. (b) Individual filled-and-stroked shapes at 50 percent group opacity: each border overlaps its fill. (c) Italic text and its red halo faded together at 50 percent opacity. (d) Labeled vector blocks inside 32 groups, each at 99 percent opacity. All text and shape layers remain vector in SVG/PDF; only panel a contains an image. Recipe and artwork: MIT, Mark Marosi.}