Why is my image banner not displaying as pure white on my website?

[Mark186]

Hi,

I am using this image banner for the main page in my website - gaelicgloves.com

The image I am using has a transparent background. If you check out my website you can see that the image banner colour isn't quite white. To be exact it is this colour - #F6F6F6

Does anyone know why this colour is overriding my Scheme colour

As you can see my navbar is white but the image banner is slightly different. Any ideas?