Capabilities
Video  Audio  RGB  YUV  YUV422  multiple instances  processing type 
yes  no  no  yes  no  no  POST 
Introduction
This filter blurs or sharpens an image depending on the sign of "amount". You can either set amount for both luma and chroma or you can set it individually (recommended). A positive value for amount will sharpen the image, a negative value will blur it. A sane range for amount is 1.5 to 1.5. The matrix sizes must be odd and define the range/strength of the effect. Sensible ranges are 3x3 to 7x7. It sometimes makes sense to sharpen the sharpen the luma and to blur the chroma.
Parameters
Default values are shown in
[green] in square brackets.
 amount Luma and chroma (un)sharpness amount (2.02.0) [0.0]

 matrix Luma and chroma search matrix size (363 x 363) [0x0]

 luma Luma (un)sharpness amount (2.02.0) [0.0]

 chroma Chroma (un)sharpness amount (2.02.0) [0.0]

 luma_matrix Luma search matrix size (363 x 363) [0x0]

 chroma_matrix Chroma search matrix size (363 x 363) [0x0]

 pre Run as a pre filter (01) [0]

Usage Examples
J unsharp=luma=0.8:luma_matrix=7x5:chroma=0.2:chroma_matrix=3x3