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Blur/Sharpen Effects

At the core of most of the Blur/Sharpen effects is something called a convolution kernel. It changes the brightness values of pixels using a mathematical formula. What makes each Blur/Sharpen effect unique are the user-supplied variables—the values given to the center pixel and its surrounding pixels within a three-by-three matrix. Once calculated, the formula divides the sum of those pixel values by another user-set variable and then adds yet another user-selected value to that quotient, thus creating the desired effect.

So it's not surprising the Convolution Kernel effect can handle most of the effects in this category. But Adobe's Premiere effects creators recognize that the convolution kernel is not for the faint of heart. So you'll find that it's easier to use some specific Premiere effects rather than the convolution kernel's presets, much less attempt to deal with its variables and calculations.


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