[ft] Ftdiff and Ubuntu rendering differences

[Pon]

Here are a couple of screenshots of Verdana at 13ppem rendered in greyscale
in ftdiff (compiled with FreeType 2.3.4) and Ubuntu:

http://img248.imageshack.us/img248/2121/verdana1vd3.gif
http://img248.imageshack.us/img248/2121/verdana1vd3.gif 
http://img408.imageshack.us/img408/4222/verdana2zv9.gif
http://img408.imageshack.us/img408/4222/verdana2zv9.gif 

In the first screenshot the first three columns are ftdiff running in
Windows XP and the right column is GEdit in Ubuntu 7.04. Why the discrepancy
in transparency levels? Obviously the Ubuntu rendering is most desirable in
this respect. To determine the levels of transparency I just isolated each
column and set the color mode to Indexed in Photoshop, which produces a
dialog that tells you how many colors there are.

In the second screenshot the unhinted setting in ftdiff renders different
instances of the same glyphs differently, whereas the other three modes are
perfectly consistent across the same glyphs. Anyone know what's going on
there?
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