Which of the following measures an image's width and height?

The measurement of an image's width and height is accurately described by resolution. Resolution refers to the amount of detail an image holds and is typically expressed in terms of the number of pixels in each dimension, such as width and height (for example, 1920x1080 pixels).

The resolution indicates both how much data is present and the clarity of the image; higher resolution images contain more pixels and can show finer detail. This makes resolution the direct measure of the dimensions of an image, allowing one to quantify how much visual information is present.

In contrast, aspects such as aspect ratio pertain more to the proportional relationship between width and height rather than their absolute measurements. Color depth relates to the number of bits used to represent the color of a single pixel and does not concern itself with dimensions. Pixel size might refer to the physical size of an individual pixel on a display, which again does not directly provide measurements of the overall image dimensions. Therefore, resolution is the most relevant term within this context for indicating width and height.