How effective pixels are measured
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Ref: David  []

Put your camera on a tripod and point it at the scene you want to use. make sure it is solid. Take a picture in the still mode, then roll tape in 3 x 4 mode, and again in 16 x 9 mode. Load the high resolution still, plus the 3 x 4 and the 16 x 9 video (It doesn't matter if you load the 16 x 9 in 3 x 4 mode (squished))

Grab stills from both the 16 x 9 and 3 x 4 video.

Open a paint program that can do layers and transfer modes.
(Photoshop is what I used, but Aftereffects or many other programs will work just as well)
Load the high resolution still.
Then load the 3 x 4 picture and place it over the high resolution still.
Change the transfer mode to "difference" and then stretch the 3 x 4 image until it matches the under lying high resolution still. You will know that it is a perfect match when the entire area of the 3 x 4 image turns totally black (the "difference" between 2 identical images is nothing (black))
Turn of the 3 x 4 layer, and then do the same thing with the 16 x 9 image. Save the image, maintaining the layers. The number of CCD pixels used for the high resolution still is likely the size of that still if you crop the image to the size of the 16 x 9 image, that should tell you the actual pixel usage for 16 x 9 images. Un do, and crop to the 3 x 4 image to get that size.

I think my numbers are exact to close, so you could presize the 3 x 4 and 16 x 9 images to those sizes before layering them to verify the numbers (it would be easier than stretching.) I hope that answers your question :-) Good luck with the camera. It seems like it might be a pretty nice. The weakest thing I saw was it's low light performance, but even that was decent.