Blur
(note to myself - correct offline docs too) |
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{| border=1 cellspacing=1 cellpadding=4 | {| border=1 cellspacing=1 cellpadding=4 | ||
| v2.58 | | v2.58 | ||
| − | | MMX routines fixed (have full 8 bit precision); mmx=true by default | + | | MMX routines fixed (have full 8 bit precision now); mmx=true by default |
|- | |- | ||
| v2.57 | | v2.57 | ||
Revision as of 20:24, 21 September 2014
Blur(clip clip, float amount, bool MMX)
Blur(clip, float amountH, float amountV, bool MMX)
Sharpen(clip clip, float amount, bool MMX)
Sharpen(clip, float amountH, float amountV, bool MMX)
This is a simple 3x3-kernel blurring filter. The largest allowable argument for Blur is about 1.58, which corresponds to a (1/3, 1/3, 1/3) kernel. A value of 1.0 gets you a (1/4, 1/2, 1/4) kernel. If you want a large-radius Gaussian blur, I recommend chaining several copies of Blur(1.0) together. (Anybody remember Pascal's triangle?)
Negative arguments to Blur actually sharpen the image, and in fact Sharpen(n) is just an alias for Blur(-n). The smallest allowable argument to Blur is -1.0 and the largest to Sharpen is 1.0.
You can use 2 arguments to set independent Vertical and Horizontal amounts. Like this, you can use Blur(0,1) to filter only Vertically, for example to blend interlaced lines together. By default amountV=amountH.
Changes
| v2.58 | MMX routines fixed (have full 8 bit precision now); mmx=true by default |
| v2.57 | added MMX option |
