| Video || Audio || RGB || YUV || YUV422 || multiple instances || processing type || frames needed |
| yes || no || yes || yes || no || no || POST || 1 |
VirtualDub's XSharpen Filter. This filter performs a subtle but useful sharpening effect. The result is a sharpening effect that not only avoids amplifying noise, but also tends to reduce it. A welcome side effect is that files processed with this filter tend to compress to smaller files.
Default values are shown in [green]
in square brackets.
- strength How much of the effect (0-255) 
- When this value is 255, mapped pixels are not blended with the original pixel values, so a full-strength effect is obtained. As the value is reduced, each mapped pixel is blended with more of the original pixel. At a value of 0, the original pixels are passed through and there is no sharpening effect.
- threshold How close a pixel must be to the brightest or dimmest pixel to be mapped (0-255) 
- This value determines how close a pixel must be to the brightest or dimmest pixel to be mapped. If a pixel is more than threshold away from the brightest or dimmest pixel, it is not mapped. Thus, as the threshold is reduced, pixels in the mid range start to be spared.
Donald Graft, Tilmann Bitterberg