Final answer:
Pixel bit depth in a digital image mainly influences the scale of contrast, enabling more colors and finer gradations, thus affecting how distinct or different colors and shades appear.
Step-by-step explanation:
When viewing a digital image, pixel bit depth will have a direct influence on the scale of contrast. Pixel bit depth refers to the number of bits used to represent the color of each pixel, with higher bit depths allowing for more colors and finer gradations between them. Therefore, the bit depth affects the contrast of the digital image, which defines how different or distinct the colors and shades appear within the image. This does not directly affect other attributes such as mottle, brightness, or spatial resolution, although they are also important elements in the overall image quality. Pixel bit depth refers to the number of bits used to represent each pixel's color in an image. A higher bit depth allows for a greater range of colors and shades, contributing to improved contrast and smoother gradients in the image. Therefore, the scale of contrast is directly affected by the pixel bit depth.