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ACF

Type: Settings Files

Acronym: Adobe Photoshop Custom Filter File

Opens With: Adobe Photoshop CS5

Convolution kernel file created by Adobe Photoshop, an image-editing program; contains a NxN kernel matrix of values used to manipulate the neighboring pixels surrounding a given pixel; can contain positive and negative values as well as mathematical expressions.

Convolution kernel matrixes can be used for blurring, sharpening, embossing, or performing other raster graphic operations to an image; once saved in an ACF file, they can be repeatedly applied to images.

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