Fonts on the board
are likely (usually) anti-aliased.
To make them match (since the board is in grayscale) try making your text image in greyscale. You'll get a lot more bang for your 256 colors and not have to suffer JPG artifacts.
(
Syncubus Yarr! Ye'll be walking Planck's Constant! [GMT-5],
Wed 10 Mar 2004, 4:38,
archived)