Quality of a raster image is determined by the __________ and the amount of information in each pixel.

• A. Image file size
• B. Compression method
• C. Image file format
• D. Total number of pixels

Answer: (D)

Quality of a raster image hinges on how finely it’s sampled and how rich the color information per sample is. The total number of pixels sets the resolution and thus the level of detail you can display; more pixels mean a crisper, more detailed image. The amount of information in each pixel corresponds to color depth, which determines how many colors and shades can be represented. Together, these two factors define true image quality. Image file size, compression method, and file format affect storage and transmission, but they don’t determine the intrinsic fidelity of the image itself.