To calculate the size of an image, the formula used is: = Width x Height x Channels x Bits per channel. For a normal RGB image with a width of 2000 and a height of 3000, you have 3 channels and 8 bits per channel. Therefore, the calculation would be 2000 x 3000 x 3 x which equals bits. When converting bits to bytes, you divide by 8 to find that this equals 18 .
In another example, for a grayscale image of the same dimensions, we would only use 1 channel for grey, resulting in the calculation of 2000 x 3000 x 1 x 8 = bits. Dividing this by 8 gives us a total of 6 . For images with different specifications, such as a black and white image measuring 40 by 30, we would again alter the values in our equation, leading to 40 x 30 x 1 x 1 = bits, which converts down to 15 when we divide by 8.
Lastly, considering a custom image that is measured at 50 by 20 with 8 bit color depth, it gives a result of 50 x 20 x 8 = bits. Dividing by 8 for bytes, we reach a final amount of 1000 , which equates to 1 . Understanding how to manipulate these values is key to accurately calculating image file sizes.
