Lyric High Pass Luma
High Pass Luma
The Lyric High Pass Luma filter is a color-correction effect that applies a high-pass filter to the luminance channel in the source video image. This has the effect of heavily flattening the luminance, removing all the gross luminance shifts, leaving only those in the high-detail areas of the image. In this state, the luminance is in a smooth, narrow hump centered around middle gray which can be expanded out again using the built-in contrast control to bring back dynamic range, but in such a way that the broad areas in the image have neutral luminance. In the same ways as Lyric's Contrast Mask, this can simulate the 50's style color postcard look, flat with over-saturated colors.
The Lyric High Pass Luma filter includes a set of effect controls that are common across all Lyric effect filters. For a detailed description of these controls, please see the Common Effect Controls documentation.
Additionally, all Lyric Effect filters can be applied through mattes or masks to constrain the filter effect to particular areas of the image. For background information on mattes and masks, please refer to the Lyric Matte Primer.
The Amount slider sets the level of filtering applied. Since the fine detail is preserved, high filtering levels can emphasise any small-scale noise in the video, so the Luma Smoothing control can be used to mitigate this, or to flatten the tonal range even further.
Contrast Adjust is used to apply contrast adjustments after the high-pass filter has been run on the luminance channel. It can be used to regain dynamic range.
The Effect Controls section is a set of common controls that are documented on the Common Effect Controls page. They can be used to achieve masked and other specialized filter effects.