Foveon: Disruptive Image Technology Message Board

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Technology Stocks : Foveon: Disruptive Image Technology

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To: miraje who wrote (20)	3/2/2003 11:33:56 AM
From: j.m. walsh	Read Replies (1) of 36

James - It's more than just the number of pixels...although that has become a measure of merit in the popular press. To get color, typically three devices are used. Light is split into three parts according to color. In expensive video cameras, prisms and dichroic optics are used. So THREE chips then capture the pictures. combining those three signals gives a great looking image. Glass is expensive to make, machine, and use. So sometimes Filters are used that let certain colors through, which fall onto different parts (typically vertical stripes) of the imaging chip. Thus, "real" resolution is reduced because only 1/3 of the pixels on the single chip are responding to each color. Again, typically, two colors are used. Combined with the overall "black and white' part of the picture, or luminance, most all colors can be regenerated. Resolution falls, and artifacts often appear in the pictures. Foveon's chip gets All Three Colors from One Chip. So, comparisons of "pixel counts" is meaningless. The X3 is also a CMOS device, not a CCD; which has mostly advantages in manufacturing and performance... JMW

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