Black & White With A Digital Camera
Concentrate on tonality for the best monochrome results
Predicting Filter Effects
When you place a colored filter over the camera lens or use one of a digital camera's colored filter effects, objects of the filter's color and similar colors will reproduce lighter and objects of the filter's complementary color darker than in a photo made without a filter. The trick is determining which colors are similar to the filter's color and which are complementary. This "color disk" will help.
Most digital cameras that have a black-and-white mode offer a great solution to these problems: built-in digital colored filter effects. Just select the camera's yellow, orange, red or green filter, and you'll get pretty much the same effect the real filter would produce attached to the lens, but without any of the hassles. But I'd recommend bracketing exposures the first few times you use your camera's filter effects to make sure you get an image you like.