A multi-featured blur effect with several modes:

• Gaussian - Blur each pixel according to a Gaussian distribution, where pixels further away from the center pixel have a lower contribution to the center pixel output.
• Box - Blur each pixel by taking an unweighted average of the nearby pixel colors.
• Radial - Blur each pixel by taking a Gaussian-weighted average of a line of pixels radiating from the center of the image.
• Light Streaks - Blur pixels horizontally after taking a threshold of image brightness. Works especially well with HDR images, where some objects use high-intensity emissive colors or the scene contains extremely bright lights.

Parameters

Note that some parameters only appear under some blur modes.

• Blur Mode - Which blurring algorithm to use. Choose between Gaussian, Box, Radial, and Light Streaks.
• Strength - How strongly the image is blurred. This impacts the size of the blurring kernel, so each effect is less efficient when strength is increased.
• Blur Step Size - For Gaussian, Box, and Light Streaks, this adds gaps in the blurring kernel, resulting in a “sparse” blur where far-away pixels may be considered without sacrificing performance. For Radial, this impacts the gap between each texture sample.
• Luminance Threshold - For Light Streaks, this is the brightness level which a pixel must exceed to produce streaks. For a non-HDR image, a completely white pixel has brightness 1.