Incorrect pasted image size

[Matty440]

I am trying to paste an image to a worksheet but the image is not being paste at the correct size. I am exporting an image from MSProject and after several attempts at this I have found that I have to export the image at 0.8125 of the size I want which when I then paste it, I get the size I actually wanted. I am getting the size from pixel counts. The fact it is a roundish number and not a random decimel leads me to belive there is a reason behind it.Can anyone explain it?Matt