Apple removed the ability to select the graphics setting for the built-in 10.5x Remote Desktop application…. But, this command:
defaults write com.apple.ScreenSharing controlObserveQuality n
…changes the quality of the connection’s display, based on the value of n:
1 = black and white
2 = grayscale
3 = 8-bit color
4 = 16-bit color
5 = full color
Which can be used as a workaround for that slider. Sadly, needing this work around doesn’t appear to be changing anytime soon. Snow Leopard does not restore this ability, and this workaround is still needed.
(Based off this hint at Mac OS X Hints..)
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