How is the file size for graphics calculated?

The calculation of the file size for graphics is fundamentally based on the dimensions of the image in conjunction with the color depth, which determines how many bits are used to represent the color of each pixel. The correct method includes multiplying the height and width of the image to get the total number of pixels. Each pixel's information is then multiplied by the bit depth (which is often referred to as color depth), indicating how many bits are used to represent the color of each pixel.

The inclusion of the dpi (dots per inch) in the formula makes sense when considering printing, as it integrates the resolution into the calculation. However, for digital file storage, it's important to divide by 8 to convert the total bit count into bytes since file sizes are commonly expressed in bytes. This results in a formula that accurately reflects the overall size of the graphic file in bytes.

This method comprehensively accounts for the elements that contribute to file size, ensuring that both dimensions and color representation are included in the calculation.