It is said that if a photo does not look good in color, it could still look decent in black and white. Indeed, but only to some extend, but even if it is so it's usually down to pushing it. The truth is that if you want to have great results in black and white, you should post process your photo in color first. If you capture something really interesting, and the shot is slightly out of focus or the composition is off, sure thing, convert it to black and white, throw some filters and call it art. But if you are serious about your portfolio or the quality of your photography art, then you will want your photos to look amazing regardless of whether they are in back and white or color. For me, black and white conversion takes LONGER, than editing photos in color. I make sure I got my shot tuned in color version, and then I work on black and white. I usually decide on post processing in the very moment of capturing the image, especially that retouching is an integral and essential ingredient of a successful image. If you want to learn more about black and white conversion watch my full length in-depth photoshop video tutorial.