How to set Screen Sharing to greyscale on Leopard 10.5

The new screen sharing feature (just a built in VNC client) is decent, although I would've liked it better if it gave an option to view the connected computer in greyscale (like Apple Remote Desktop can), so as to make the screen redrawing much quicker. This is how you do that:
To change this setting manually, open up the Terminal and type in the following command:
defaults write com.apple.ScreenSharing controlObserveQuality 2
This changes the controlObserveQuality setting within this plist file: “~/Library/Preferences/com.apple.ScreenSharing.plist” file to 2, which is grey scale. To change it to a different resolution, substitute the number 2 with one of the following numbers:
1 = black and white
2 = grey scale
3 = 8 bit color
4 = 16 bit color
5 = full color
However, when you've connected and you're all happy that you have greyscale, if you then choose Adaptive Quality from the View menu in Screen Sharing, this will set the default back to 3 (8 bit color), and you'll have to run the Terminal command or edit the .plist file again - so, just leave it when you initially set it and all will be well!
----

I tried the malisphoto.com solution it but it didn't work for me.
I even tried the one at entropy.com but that also didn't work.
I was very careful and successful in the command line (bash) and afterwards, phpInfo() showed that the GD library was installed, however, my localhost GD (gif draw) scripts still kept showing the same old error messages on my localhost (and not online): "Fatal error: Call to undefined function imagecreatefromgif()"
Perhaps I'm just wrong to think PHP GD will work on my localhost pages after performing these installations - perhaps I'm misunderstanding something? Am I'm trying to change a light-bulb with a jack-hammer?
I should also point out that both solutions made my localhost run extremely slow. After restoring my system, it's all working fine (but without php GD).
My system is a Power Mac 10.5.8 Leopard
This is really lame. Is Apple trying to shut out PHP now? Is PHP the new "Flash"?

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