Originally Posted by joshll

Filter...using hue/saturation...then pen tool around the area you want coloured...grab your lasso tool, right click...select inverse, this should select the colour part if you make the penned layer invisible. create new layer, copy and paste your inverse selected part back to its place and line it back up into the original layer, then hue/saturate it back into colour.

Josh
From the guy with no references. ;-)

Originally Posted by Deej

easy PS... 2 layers... pen... delete... color augmentation... done

Originally Posted by mynameisjim

I don't think you have to mess with the colors.

Open the pic, cut out the part you want in color, paste it on a new layer, then put a BW copy of the original pic under that layer.

You can mess with the hue and saturation if you want more vibrant colors.

Now cutting it out can be tough depending on how complicated it is. You can use the extract filter or do it yourself with the pen tool (most exact) or lasso tool.

Originally Posted by The Truth Hurts

add a black & white adjustment layer above the original pic...
with the adjustment layer selected paint with black parts you want to be in color
tweak til you're satisfied.
done.

Originally Posted by Sam Granger

You can duplicate the photo, then make the bottom layer b/w. Then remove all colours from the second layer besides the colour you want to keep in the Channels part. Erase parts that are still coloured that you don't want to keep coloured.