4.1.3.1. IIR vs. RLE Gaussian Blurs
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GIMP supports two implementations of Gaussian Blur: IIR G.B. and RLE G.B.
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They both produce the same results, but each one can be faster in some cases.
RLE Gaussian Blur
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RLE stands for run-length encoding
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RLE Gaussian Blur is best used on computer-generated images or those with
large areas of constant intensity.
IIR Gaussian Blur
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IIR stands for "Infinite Impulse Response".
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This blur works best for large radius values and for images which are not
computer generated.
Written by Shlomi Fish