RGB values shifted by Keynote

I'll start off by confirming that I'm running the lastest downloads of everything Apple software update has to offer.
I've used the DigitalColor Meter to read RGB values for a colour that I've seen on a website and fancy using as a background for my Keynote presentations. The values are incidental, I guess, but here they are: 241, 241, 213. Welcome to putty.
In Keynote, I've put these figures into the RGB control box and yet to my eyes while the colour created is close to my target, it is obviously not the same.
When I use DigitalColor Meter to read the values of what Keynote has actually created, it shows 239, 248, 218. This is while Keynote simultaneously shows that the colour I am using is exactly the one for which I've given it the figures 241, 241, 213.
This clearly isn't a monitor calibration problem, but a Keynote-not-reading-its-own-colour-input-boxes problem!
Just to be double-sure, I've set Keynote to use a suitably coloured Word page as its background image and, unsurprisingly, the DigitalColor Meter shows that Keynote can show 241, 241, 213.
I'm sure that I've done this in the past without this hiccough. Any suggestions, please?
Thanks
Brinley
MacBook C2D 2Ghz Mac OS X (10.4.9)
MacBook Mac OS X (10.4.9)

The RGB figures for the colour that the Keynote generates from the 'magnifying-glass' method rather than 'manual input' method match the target website colour exactly: 241, 241, 213. Keynote thinks it is reproducing these figures and DigitalColor Meter confirms that it actually is ... the values are no longer 'shifted' in the way that prompted my question.
You've almost certainly asked a question which is at the centre of this, though: I forgot that I bought a Huey colour-calibration device and so my display is now set to whatever that thought best. The colour profile that that device has generated is way better than the Mac default, which set the contrast much too high (everything was both washed out and neon at the same time, somehow) and blue-tinged.
This explains why I got the manual input method to work before--that predates my purchase of the Huey.
Thanks for your prompt and clear input!
MacBook Mac OS X (10.4.9)

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