What term describes the width-to-height ratio of a pixel in a digital image?

• A. Pixel Size
• B. Pixel Aspect Ratio
• C. Image Ratio
• D. Pixel Density

Answer: (B)

Pixel aspect ratio describes the width-to-height ratio of a single pixel. It tells you whether pixels are square or rectangular, which affects how an image is displayed. When pixels aren’t square, software must account for this ratio to render the image without distortion and to determine the correct display aspect ratio. For example, some SD video formats use non-square pixels, so the pixel aspect ratio helps convert the image data into the proper on-screen shape. Other terms don’t describe the shape of an individual pixel: pixel size refers to how large a pixel is, image ratio to the overall frame’s aspect, and pixel density to how many pixels fit in a given area.