TechTreak

If you’ve watched Sin City, you probably know what the Sin City effect is. If not, it’s basically making pictures mostly black and white with only one or two colors. It’s usually used in showing or changing eye color to publish around online communities. I used the technique in one of my dog’s pictures. You’ll notice the eye color isn’t the only thing I changed, but that’s the main thing.
Original Image

Sin City Effect

Here’s the tutorial I used. It’s easy to follow but if you get stuck on anything just ask.
Sin City Effect (YouTube)