Here you can select image hovers color and opacity (fig. 1):
Also you have an option to make all images in content area and footer greyscale (see fig.2). This feature will work fine in all modern browsers except Internet Explorer. (Thankee, Microsoft!)
In the “Style” box (fig. 3) select “Grayscale” or “Grayscale with color hovers”.
- “Grayscale” will give you grayscale images with regular hovers (fig 4.1).
- “Grayscale with color hovers” will make your images grayscale and revert them back to color on hover (fig. 4.2).