Removing a 'Theme Colour Overlay'

Hey guys,

I purchased a theme from Theme Forest and I have been able to make adjustments for most of what I’m wanting to play with but I’m stuck with how to remove either the ‘Black or White’ colour overlay from the site.

At the moment, I have my background image set, it loads and then a black overlay covers up the background image.

I have found the following line of CSS in Firebug, adding an image to the “background-image: none;” gives me an image but I can’t actually find anything like this in the CSS.

body.home #supersized_overlay, body.page-template-template-gallery-f-php #supersized_overlay, body.page-template-template-gallery-flow-php #supersized_overlay, body.page-template-template-gallery-carousel-php #supersized_overlay, body.single-gallery #supersized_overlay {
background-attachment: scroll;
background-clip: border-box;
background-color: rgba(0, 0, 0, 0);
background-image: none;
background-origin: padding-box;
background-position: 0 0;
background-repeat: repeat;
background-size: auto auto;
}

Does anyone have any ideas of how to get around this?