Blur
Raffriff42 (Talk | contribs) m (use Template:Frac (meh)) |
Raffriff42 (Talk | contribs) m (Citation_needed) |
||
| Line 7: | Line 7: | ||
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''. | 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''. | ||
| − | A Known issue, with the MMX routines is the lack of full 8 bit precision in the calculations. This can lead to banding in the resultant image. Set the MMX=False option to use the slower but more accurate C++ routines if this is a concern. | + | A Known issue, with the MMX routines is the lack of full 8 bit precision in the calculations.{{Citation_needed}} This can lead to banding in the resultant image. Set the MMX=False option to use the slower but more accurate C++ routines if this is a concern. |
'''Changes''' | '''Changes''' | ||
Revision as of 18:29, 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.
A Known issue, with the MMX routines is the lack of full 8 bit precision in the calculations.[citation needed] This can lead to banding in the resultant image. Set the MMX=False option to use the slower but more accurate C++ routines if this is a concern.
Changes
| v2.57 | added MMX option |
