In digital images, what term describes the smallest unit of an image file that stores brightness information?

In digital images, what term describes the smallest unit of an image file that stores brightness information?

• A. Pixel
• B. Voxel
• C. Bit
• D. Byte

Answer: (A)

In digital images, brightness is captured at each discrete spatial location by a picture element called a pixel. Each pixel holds the brightness value for that tiny area (and often color information through channels if it’s a color image). That makes the pixel the smallest unit that represents brightness in a 2D image file. A voxel is the 3D counterpart used for volume data, not standard 2D images. Bits and bytes are data-size units, not the spatial sampling unit, though they store the actual brightness values within a pixel.

In digital images, brightness is captured at each discrete spatial location by a picture element called a pixel. Each pixel holds the brightness value for that tiny area (and often color information through channels if it’s a color image). That makes the pixel the smallest unit that represents brightness in a 2D image file. A voxel is the 3D counterpart used for volume data, not standard 2D images. Bits and bytes are data-size units, not the spatial sampling unit, though they store the actual brightness values within a pixel.