像素
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定义
像素（picture element）是数字显示器或数字图像中可单独寻址的最小彩色点。
解释
Each pixel on a color display contains sub-pixels for red, green, and blue (RGB), each controllable independently. A 4K display has 3,840 x 2,160 = 8,294,400 pixels. Pixel size on screen depends on display resolution and physical dimensions: a 27-inch 4K monitor has pixels about 0.16 mm wide. In photography, 'megapixel' counts refer to millions of pixels captured by the sensor.
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