Remove gray tint before mouse over masonry

Hi again…

I’m an eager user of the Enfold theme and I’m using it for all my clients :) Thanks for a good theme!

I’m working on a webpage for a photographer and she wants it as clean as possible. We are using a masonry as buttons but we would like to remove the gray tint on the images before a mouse over. She wants the pictures to be the original ones from the start, so they don’t seem faded and gray. An example is this site:

So all the three images are graded out from the start. How can we remove this effect?

I’ve tried the ‘remove overlay’ css:

.image-overlay {
visibility: hidden;
}

but that only removes the overlay and arrow that we DO LIKE :) So we need a function that do not remove the other overlay but removes the gray tint in masonries.

Thanks!