From: Philippe Verdy (verdy_p@wanadoo.fr)
Date: Wed Dec 03 2003 - 18:42:53 EST
From: John Hudson
> If you have an LCD screen, ClearType can significantly improve
> the display
> of even poorly hinted fonts, but hinting in the y-direction remains very
> important even then.
ClearType works on LCD because the 3 R,G,B pixels are equal vertical bars
making a complete color pixel (so a single white pixel can effectively be
have three horizontal aligned positions: R+G+B, G+B+R and B+R+G). This
nearly triples the horizontal resolution for hinting, but it's a shame that
no solution has been developped for CRT displays, where pixels are typically
rendered in a hexagonal matrix, that the hinting process could consider.
Other geometric shapes are used in color CRT, notably with Trinitron CRT
displays, and hinting could exploit these properties. The main issue with
CRT is that it's difficult to predict the alignment of the rendered
hexagonal matrix on the difracting surface, as pixels (accelerated electron
beams coming with a slightly different angle) tend to be difracted in
another triangular shape through the dotted metalic screen that's just
before pigmented surface.
But I think that some maths on the effect of this unpredictable (because of
size adjustment by monitor controls) diffraction through the metallic grid
could reveal interesting geometric properties, that could be used in the
hinting process, if the rendering area is represented by a non orthogonal
coordinates system (with 2D plane axis at 60?).
Is there some search in this area to enhance the resolution of graphics or
typeseted text in non rectangular systems like CRT displays? And if so, what
are the possible artefact effects caused by distinct chromatic properties of
screens, and distinct white temperature?
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