Here is the original picture of the Lancashire County Council building with the dimensions of 2560x1698 pixels. I am going to change the aspect ratio to better suite various uses online.
first in 100x100, then by 400x300 and finally 200x500. The left image is cropped and the right is simpley resized.
Here is the second image (aspect ratio of 100x100)
(cropped) 
(re-sized)
Here is the third image (aspect ratio of 400x300)
(cropped)
(re-sized)
Here is the 4th image (aspect ratio of 200x500)
(cropped)
(re-sized)
As is evident from the pictures it is important to conserve the aspect ratio of the original image to avoid it distorting The aspect ratios used differ from my original image and so the other option would be to crop the images instead which would prevent the image distorting at the cost of the some of the image being cut out of frame.
