One image came to mind almost instantly when I read Cee’s Black and White Photo Challenge: Moving Water prompt.
It was this image of a wave on the Georgian Bay shoreline taken at sunrise. The colour original on Kodachrome has been giving me grief since I did the first scan of it. Multiple scans and copies later it’s still giving me grief. If I get the colour of the wave looking correct the stones look wrong and vice versa. So I decided to try a selective colour treatment, converting most of the image to monochrome apart from a handful of the pebbles.
A different wave from the same location. I did a straight monochrome conversion of this shot trying to maintain the sense of movement in the water.