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The mapping mode for the pixels outside of the border in the Gaussian blur effect.
BorderColor: 1;
Always blend the border pixels with borderColor.
Bounce: 5;
Bounce off the border: gfedcb|abcdefgh|gfedcb.
Default: 0;
Blend the border pixels with surrounding pixels, if possible, or with borderColor if the border is at the edge of the source image.
Mirror: 4;
Mirror the last few border pixels: fedcba|abcdefgh|hgfedcb.
RepeatEdge: 2;
Repeat the very border pixel color: aaaaaa|abcdefgh|hhhhhh.
Wrap: 3;
Take colors from the opposite edge: cdefgh|abcdefgh|abcdef.