对于一台数码相机来说，通常会标示CCD的像素（total number pixel）和有效像素（effective pixel）,我们用通常的334万像素的CCD来解释一下子。
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有效画素(Effective Pixel)：是指相机之影像感测器接受光感测后，真正参与感光成像的画素。
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non-effective pixel 无效像元
Effective pixel quantity 有效像素数
Worse, using the high-definition wide-screen mode puts black bars at the top and bottom of the viewfinder, reducing the effective pixel count by 25%.
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Red claims the dedicated CMOS sensor means no color debayering, yielding a one-to-one pixel count and 15-20 percent bump in effective resolution compared to its chromatic cousin.
ENGADGET: Red introduces $42K Epic-M Monochrome cinema cam, on sale October 1st
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