To give the parrot similar contrast with the background in black and white, a color filter should be chosen which translates bright red into a tone which is significantly different from the middle gray background. Consider the example below, where the original color image makes the red parrot stand out against the near colorless background. Just as with color photography, black and white photography can use color to make a subject stand out - but only if the appropriate color filters have been chosen. Careful selection of these filters allows the photographer to decide which colors will produce the brightest or darkest tones. These can block all but a primary color such as red, green or blue, or can partially block any weighted combination of the primary colors (such as orange or yellow). Filters are named after the hue of the color which they pass, not the color they block. Color filters are often used in front of the lens to selectively block some colors while passing others (similar to how color filters are used for each pixel in a digital camera's bayer array).
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