The Gaussian Blur filter uses a Gaussian function to blur an image and remove detail and noise. Parameters: Size Controls the blur power. Value of 1.0 sets the maximum blur, but you can enter in edit field values up to 4.0 and get  more blur, but with a slightly reduced quality. See also Gaussian Blur variations: Gaussian Blend - Blur an image and blend with the original. Variable size - control the blur power within the frame with a Radial Mask, or Linear Mask.