Quartz Composer effects render blank white video - confused re Core Image

I've tried the Quartz Composer effects in iMovie 6 but they preview as blank white video and when I apply the effect they render as blank white video.
Here's my video config:
Chipset Model: ATY,RADEON
Type: Display
Bus: AGP
Slot: SLOT-A
VRAM (Total): 32 MB
Vendor: ATI (0x1002)
Device ID: 0x5144
Revision ID: 0x0000
ROM Revision: 113-74901-224
Displays:
Acer AL1912:
Resolution: 1152 x 870 @ 75 Hz
Depth: 32-bit Color
Core Image: Not Supported
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
After reading this page:
http://www.apple.com/support/imovie/hottips/
I see that the Quartz Composer effects are supported only for Core Image supported video cards. I think that means I'm out of luck. It seems odd that the effects still attempt to render and be applied even if my system doesn't support them. Is something wrong with my installation, or is this expected behavior?
I've seen statements here on the discussions that Quartz Extreme should enable effects like the ripple when opening or closing Dashboard Widgets. My card does support Quartz Extreme but I do not see the ripples. I'm guessing that it's actually Core Image that produces those effects and that's why I don't see them. Is that a correct guess?
I guess I'm confused over the difference between Quartz Extreme and Core Image.
Thanks for clearing up my confusion...

Quartz Extreme, as I understand it, is used by OS X for drawing windows
That is true. Quartz Extreme is a special, hardware accelerated instance of Quartz. Quartz is OS X's native drawing environment. When Quartz Extreme is not supported, Quartz will be used instead.
Quartz Composer is something else that builds on Quartz. It appears it requires Core Image. Core Image is a set of graphics routines that allow image manipulation (if you have the developer package installed, you can also find an application called 'Quartz Composer' that you can use to define effects, screensavers etc).
Core Image also intents to leverage your GPU. Apple's Documentation alleges that if there is no GPU available it will use the CPU instead. Theoretically, your Mac should support Core Image. Yet...
From Dennis' System specs:
Core Image: Not Supported
This may be the reason why you can't use these effects in iMovie. Because of shortcomings in iMovie's plug-in API, the plug-ins may still show up in the f/x panel - they simply will not function when selected.
Perhaps a later version of OS X enables CoreImage on all Macs?
Hope this helps,
-ch
Please Note:
I work for cf/x, and may profit from posting here.

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