What does the term 'dimension' indicate about an image?

The term 'dimension' in relation to an image specifically refers to the number of pixels that make up the image in the horizontal and vertical directions. For example, an image with dimensions of 1920 x 1080 pixels means it is 1920 pixels wide and 1080 pixels tall. This measurement is crucial as it directly impacts the image's resolution and clarity when displayed on different devices. Higher dimensions generally indicate better detail and quality, making it essential for understanding how an image will appear when printed or viewed on screens of various sizes.

The other options relate to different characteristics of images, such as file formats, recommended display sizes, or color schemes, but they do not define 'dimension' itself. Consequently, they do not accurately capture what the term means in the context of image specifications.