I suspect one needs to blend with a transparent white temp canvas, not black, for the TT glyphs to render correctly.

In

transformBy: aDisplayTransform clippingTo: aClipRect during: aBlock smoothing: cellSize

*snip*

start to: 2 do:

[:i | "If i=1 we first make a shadow and erase it for opaque whites in B&W"

subCanvas := self class extent: patchRect extent depth: self depth.

i=1 ifTrue: [ warp combinationRule: Form erase ]

ifFalse: [ warp combinationRule: rule].

rule = Form blend ifTrue: ["If we want a subcanvas to actually blend nicely, it better be translucent white than translucent black..."�

].

Unfortunately, the merging of Color and AlphaColor seems to have broken pretty much every path I could think of to transform translucent black pixels into translucent white pixels (or, maybe doing something like that easily has never worked),

and I CBA to fix every method in Color dealing with alpha -> pixel conversion, so this remains a theory.

Cheers,

Henry