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Optimize Image Contrast

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Old 05-06-2010, 12:31 AM
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colorexperts colorexperts is offline
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Optimize Image Contrast

When you see a sharp edge in an image, it's because the difference between dark and light—that is, contrast—is higher along that edge than in other areas. When you apply a sharpening filter in a program such as Photoshop, you boost contrast only along edges, creating the illusion of heightened sharpness. But it isn't just edge contrast that affects whether you perceive an image to be sharp. Every adjustment that affects overall contrast contributes to what looks like sharpness. You can apply contrast to the entire image, to specific tonal ranges within the image, and to specific areas.
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Old 05-07-2010, 07:50 AM
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W.Smith W.Smith is offline
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Re: Optimize Image Contrast

Who would have thought!
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Old 05-07-2010, 08:58 AM
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Re: Optimize Image Contrast

You can apply a drastic contrast increase to a smooth gradient and still cannot say you have made it sharper. There is a need to differentiate between the terms. If you wanted to define sharpness in terms of contrast increase, you should add the word local. Sharpening is an increase in local contrast constrained to small radii.

It's good practice to see the high pass as the opposite of the low pass or gaussian blur, and understanding camera introduced anti-aliasing is a good step in understanding the difference between "non-sharp" and "out-of-focus". You can fix antialiasing, but you can't really cure out-of-focusness.

Last edited by flexmanta; 05-07-2010 at 12:57 PM.
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