Uniform gray again.

Getting back to our landscape photo, Figure 7.15 shows the image with the saturation boosted considerably. It's easy to differentiate the blue sky from the green mountains and brown field. However, converted to grayscale, it looks precisely like Figure 7.4. (Trust me, or try it yourself; we don't need yet another identical figure to prove this point.) When images that have objects that differ from others in the picture chiefly through saturation or color, that information is lost when the photo is converted to grayscale.

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