What is the significance of 'dpi' in the file size formula for graphics?

The significance of 'dpi', which stands for dots per inch, in the file size formula for graphics lies primarily in its role in determining the sharpness of an image. DPI is a measure of spatial printing or video dot density and indicates the resolution of a printed image or how many individual dots of ink are placed in a line within the span of one inch.

In digital graphics, when you have a higher dpi, it means that more dots are used, resulting in a finer detail and sharper image. Conversely, a lower dpi makes the image appear softer and potentially pixelated. Therefore, when calculating file size, higher dpi corresponds to greater detail and depth in the graphics, which typically requires more data to represent, thereby affecting the overall file size.

This understanding of dpi is crucial for professionals in multimedia, as it influences decisions on image quality, printing specifications, and digital presentations.