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A lot of guys on here have said that camcorders store more information for the green segment of the image, which makes for a better key. I always understood that it was precisely the opposite, that red has the most information stored (presumably due to the amount of red found in skin pigment - you wouldn't try keying out the red for footage of a person, after all!), followed by blue, then green. This means that green is ideal to key out because the least amount of image quality is lost, and it's more forgiving of variations. Also, there is a lot of blue in natural light, which makes bluescreening much more unreliable outdoors.
Am I wrong?
Now to the suggestion. I've done a small screentest based on Dulux colour cards (the free ones you get from B and Q). The best shades I found for greenscreening were from the "Fresh" range:
Green Parrot 1 (50GY 39/536)
Green Parrot 2 (50GY 51/437)
Willow Creek 1 (30GY 40/531)
Willow Creek 2 (30GY 51/423)
Kiwi Burst 1 (10GY 41/600)
Kiwi Burst 2 (10GY 52/541)
I set the White adjustment to about 30 for the best results.
I haven't got anywhere to host the image yet, but I'll probably try next with tester pots to find the best colour. Stay tuned