VIRTUALDUB FILTERMOD FREE

However, it can allow for recovery of very bright colors that would ordinarily white-out or become garish yellows due to signal overamplification. This is only useful if the capture format uses the YCbCr color space, as these values are already lost if RGB is used. These levels are ordinarily shown as red at the upper end of the histogram scale and would be clamped to white without this option. Extend luma white pointĬompresses the luminance range of an image so that 'superwhite' levels from 0-15 are scaled to within the valid luminance range of 16-235, out of 0-255. The transform is a straightforward linear mapping of the luminance values from to, if extend luma white point is disabled, or to if that option is also enabled. These levels are ordinarily shown as red at the lower end of the histogram scale and would be clamped to black without this option. Extend luma black pointĬompresses the luminance range of an image so that 'superblack' levels from 0-15 are scaled to within the valid luminance range of 16-235, out of 0-255. Note that vertical reduction causes fields to be blended together, which can cause ghosting artifacts due to motion within the image.

This option consumes a decent amount of CPU power and should be used with care however, it can also significantly speed up subsequent video compression due to the smaller output image. This is useful if the additional vertical resolution is not required, but better image quality is desired than would be obtained by using the capture device's scaler, which often handles such a request by simply throwing away one of the fields (every other scanline). Reduces the vertical height of the captured video by one-half using either bilinear or bicubic resampling. The amount of noise reduction is adjustable higher thresholds produce more noise reduction at the cost of higher motion artifacts. This is a primitive noise reduction filter, but can be effective, particularly for light noise or videos with low motion. Noise reductionĪpplies a quick, first-order recursive filter to reduce the amount of noise within the image. Field swapping is a relatively fast operation. This affliction looks like a 'raspy' effect in the image. Swaps even and odd scanlines within the image to correct for a video capture device that is assembling fields in reverse order. RGB formats can be cropped to pixel accuracy YUY2/UYVY can only be cropped to the nearest even pixel boundary horizontally, and YV12/I420 to the nearest 2x2 pixel block. The video format imposes restrictions on the alignment of the cropping boundaries.

VIRTUALDUB FILTERMOD FREE

It is nearly free if vertical reduction or RGB filtering is enabled. If the video is letterboxed, applying cropping can improve performance as well as reduce output file sizes. Detailed description of capture filters Croppingĭiscards borders of the video, resulting in a smaller output video. Note that compressed video formats are not supported at all - if the capture device outputs compressed data, no video filtering is possible at all. If a capture video filter is not compatible with the input format, it is automatically disabled. Care must be taken to choose a video format which is compatible with all of the filters you wish to use: Format Unlike the normal filter system, the capture filter system does not attempt to automatically convert video filters to accommodate filter stages. If the video display mode is set to Preview and preview acceleration is enabled, the post-filtered result can be seen on the preview display. This requires a lot of CPU power to do reliably, but correcting, shrinking, and cleaning up the video before it is compressed can result in higher quality captures without requiring an additional post-process pass.Īll capture filters are accessible through the Video menu. VirtualDub allows the incoming video to be filtered before it is compressed and written to disk.

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