A Yardstick To Define Sharp?

If you wandered the LDI show floor, looking at various pattern projectors — ellipsoidal reflector spotlights, automated spots, and effects projectors — did you consider how you might describe the clarity of their projected images? Is it the sharpness of the edges in the images that makes the difference between those that are sharp and those that are fuzzy? Or is it how dark the black areas are in contrast to the light areas that make the big difference between images that are clear and those

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