What term is used to describe the density of the pixels in an image?

The term that describes the density of pixels in an image is resolution. Resolution refers to the amount of detail an image holds and is typically quantified by the number of pixels along the width and height of the image, commonly expressed in formats such as width x height (for example, 1920 x 1080 pixels). Higher resolution means more pixels are packed into the same physical area, resulting in sharper and more detailed images.

In contrast, color depth refers to the number of bits used to represent the color of a single pixel in an image, which affects the range of colors that can be displayed but does not directly relate to the pixel density. Bit rate generally refers to the amount of data processed in a given amount of time, relevant in contexts such as audio or video streaming rather than image resolution. A color model is a mathematical model describing the way colors can be represented as tuples of numbers, typically in specific formats, but it also does not pertain to pixel density itself. Thus, resolution is the correct term that accurately captures the concept of pixel density in images.