FastBlur

Abstract
Author	wonkey_monkey
Version	v0.3.1
Download	FastBlur0.3.1.zip
Category	Blurring
License	Open source
Discussion	Doom9 Thread

Description

Fast approximate Gaussian blurs.

Requirements

• [x86]: AviSynth+ or AviSynth 2.6
• [x64]: AviSynth+
• Supported color formats: RGB24, RGB32, Y8, YV12, YV16, YV24, YV411

Syntax and Parameters

FastBlur (clip, float blur, float "y_blur", int "iterations, bool "dither", bool "gamma", float "threads")

clip   =

Input clip.

float   =

Blur radius (equivalent to Photoshop Gaussian Blur's radius).

float  yblur =

Vertical blur (if different from horizontal blur)

int  iterations = 3

Number of iterations for approximation. Defaults to 3. A value of 1 performs a box blur.

bool  dither = false

Enable/disable dithering.

bool  gamma = true

Approximate gamma awareness. This should be disabled for masks.

float  threads = -1

Now has a threads parameter to set the number of threads. Defaults to half the number of logical processors minus 1, or 2, whichever is greater (unless you only have one logical processor, in which case: 1).

Set threads to 0 to use all available logical processors, or use a floating pointer between 0 and 1 as a multiplier on the number of local processors, e.g. to use 3/4 of them, set threads to 0.75. [1]

• < 0 : automatic
• 0 : use as many threads as logical processors
• < 1 : use floor(logical processors*threads) threads
• >= 1 : use floor(threads) threads

Examples

• FastBlur with strong settings:

AviSource("blah.avi")
#FastBlur(..TODO..) 

Changelog

Version      Date            Changes

v0.3.1       2021/09/30      - Enabled clamping (previously only done for 32-bit clips) to prevent overflow from dithering.
v0.3         2021/03/16      - Added threads parameter
v0.2.1       2019/12/31      - YUY2 support (now converts internally to YV16 and back) 
v0.2         2019/12/25      - Updated to fix a rounding/accumulation bug with floating point clips.
v0.1         2019/06/30      - Initial release.

External Links

• Doom9 Forum - FastBlur discussion.

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