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Easily convert photos to black and white in iPhoto 6
Authored by: DavidRavenMoon on Mar 26, '07 02:06:52PM

Turning down the saturation, and pressing the black & white filter in iPhoto does EXACTLY the same thing. Give both a try and see. They both remove the color information, resulting in a gray scale image.

There seems to be confusion as to the terms "grayscale" and B&W. In conventional photography, a B&W image is grayscale. The only way you can print in true B&W is by printing a half tone, since they are made from only black and white dots, with no mid tones. B&W on a computer would be a 1-bit (bit-mapped) file, which contains no shades of grey.

Now I'll agree that converting an RGB image to grayscale doesn't always look like a B&W continuous tone photo, and that's because of the panchromatic film does not respond equally to all wavelengths of light, so simply desaturating a colour image digitally does not give the classic black and white film look. Also our eyes are more sensitive to green light.

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