OK, this is one of my pictures. On some of the History Channel documentaries, they have used spot color on either black and white photos or sepia photos to create an “historic” effect. The spot “color” is either black and white or sepia depending on the photo. It’s an interesting effect when used within the context of old photographs.
I tried this with one of my pictures of the famous Frankenstein gravestone at Jewish Graceland Cemetery. The photo was originally taken in color. I first converted it to black and white and saved it (after saving a copy). I then added a duplicate layer and then converted it to sepia. I then used the eraser tool to “restore” the gravestone to black and white.
I use Paint.NET which is an excellent freeware program.