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Blurring

<feGaussianBlur> performs a Gaussian blur on the input image......CPFS
......in
...... stdDeviation=<number> [number]: the blurriness.
                If two numbers are provided, they represent the standard deviation along the x-axis and y-axis respectively.
                If one number is provided, then that value is used for both X and Y.

<feTurbulence> creates an image using the Perlin turbulence function......CPFS.
It allows the synthesis of artificial textures like clouds and marble.
......baseFrequency=<number> [number]: a parameter for the noise function.
                If two numbers are provided, they represent values in the X and Y directions respectively.
                If one number is provided, then that value is used for both X and Y. The higher the frequency, the smaller the individual 'noise patches' look.
......numOctaves=<integer>: a parameter for the noise function.
......seed=<number>: the starting number for the pseudo-random number generator.
......stitchTiles={stitch | noStitch}: whether to attempt smoothness at the border of tiles.
......type={fractalNoise | turbulence}: whether to perform a noise or turbulence function. Compared to a 'turbulence', a 'noise' looks softer with less obvious boundaries.