Dimensions for a website background image

Question

I am confused in deciding the dimensions for a background image for my website. I am creating a collage like image in picasa and it defines the image dimensions using aspect ratios. If I want to create an image of 2048 x 1800, what aspect ratio should I use?

Answer 1

Wolfram Alpha gives the exact result 256/225, so an aspect ratio of 256:225 is correct. (Of course, a more inexact value would be 1.14:1, which would give you something like 2052x1800.)

Answer 2

As the aspect ratio is the ratio of the width of the image to its height, the aspect ratio of 2048x1800 image is 1.14:1 (2048/1800 = 1.14).