I know this was not foreseen in the theme (not in the demo version), but I still want to try and ask: is there a way to turn the rendering of all the photos black and white on Justify Portfolio? Since the photos have quite different colors, the overall picture is not as good as it would be if all the photos were the same tone.

The idea is to make all photos appear black and white, and colors only appear when the mouse is over the photo. 

Wow, it works! Thank you, you are the best!
P.S. The colors don't change when the mouse is moved over the photo, but it would probably be too much to wish for that.

Thank you. I added the code, but somehow it doesn't work.

Wow! You simply the best. The page looks very nice now, thank you very much!

I guess you've done something extra, not just added a new pease of the CSS code? When you hovered over a photo earlier, it seemed to light up - making the caption easier to read. Now that effect is gone, therefore we have picture in color - and that's more important for us than the title, so thank you once again very much, Neuron! Maybe I already want too much: to switch from black and white to color and in addition to have a color image in a bit lighter version? If that complicated to do and takes a lot of time from you, no worries, just forget it (probably we simply delete the titles, if no other solution is available).

Thank you very much! 
With a fantastic help from you, the photos is portrayed exactly as we wanted and we are very happy with result now. 

The Bifröst theme is super cool. Thank you once again.