Which measurement describes an image's width and height using pixels?

The measurement that describes an image's width and height using pixels is known as resolution. In the context of digital images, resolution refers to the number of pixels that compose the image; it is expressed as the pixel count in width by the pixel count in height (for example, 1920 x 1080 pixels). This measurement provides insight into the image's clarity and detail; a higher resolution typically indicates more pixels, leading to better image quality and sharpness.

Other choices might represent related concepts, but they do not specifically refer to the measurement of width and height in pixels. For instance, size can refer to how physically large an image is when printed or displayed, while dimensions generally refer to measurements in various units (like inches or centimeters) and may not convey the pixel aspect directly. Scale typically relates to the proportion or ratio of an image with respect to its original size, rather than the actual pixel dimensions. Thus, resolution is the term specifically used to define an image's width and height in pixel terms.