If you are creating digital black and white photos, don’t just drop your color information. To get black and white photos with good tonal range, and subtle tonal variations, you need the color information as well as the grayscale, or black, data. This is particularly true with monochromatic HDR imagery.
The first reason that you need the color data included in your image file is intuitively obvious. An RGB image with all three color channels (Red, Green, and Blue), has three times more data than a single-channel black image. As you’d expect, grayscale files are about one third the size—and contain ...
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