Highend glallery – photos black background change

Hello
i am using your theme “highend” for the construction of my website
ive encountered a problem with the gallery when the mouse hovers over
the image, the image fades to black.
i would like to know how do i change the heavy fading or change the
color or cancel the fading all tougher.
i am a novice user of wordpress and if you may explain it to me in the
most simplest way as possible.