noun
effective pixel count; number of effective pixels
Technical term used in digital camera and image sensor specifications. Refers to the number of pixels actually used for image capture, as opposed to the total pixel count.
このカメラの有効画素数は2000万画素です。
The effective pixel count of this camera is 20 megapixels.
有効画素数と総画素数の違いを説明してください。
Please explain the difference between effective pixels and total pixels.
総画素数 is the total number of pixels on the sensor, while 有効画素数 is the number actually used for imaging.
Compound of 有効 (effective) + 画素 (pixel) + 数 (number). A straightforward technical term.