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What value represents middle gray in an 8-bit image?
255
0
128
64
The correct answer is: 128
Middle gray in an 8-bit image represents a level of brightness that is precisely halfway between black and white. In an 8-bit image, there are a total of 256 possible brightness values, ranging from 0 (black) to 255 (white). Since middle gray is the midpoint, it is assigned the value of 128. This value reflects a balance of lightness and darkness, making it a useful reference point for exposure and tonal adjustments in photography. Understanding where middle gray lies within the tonal scale is crucial for achieving proper exposure and for interpreting the contrast within an image.