Inspired by Ali Majdfar ( https://pbase.com/k_amj/selective ), here is my attempt at the creative use of selective color.
I generally do not do anything to enhance the colors in these images because converting to B&W tends to make the remaining color(s) appear more vibrant;
I do not add color that was not there in the original full color image. Some of these take longer to process than the others depending on how the desired color
is distributed in the image. For some of the images, I have added the original image for comparison.