title: MatteMonitor
media types:
Video experimental
description: A Matte Monitor: make alpha values that are strictly between 0 and 1 more visible.
After applying a Keyer, a scaling operation is usually applied to clean the matte. However, it is difficult to visualize on the output values that are very close to 0 or 1, but not equal. This plugin can be used to better visualize these values: connect it to the output of the scaling operator, then to a viewer, and visualize the alpha channel.
Alpha values lower or equal to 0 and greater or equal to 1 are leaved untouched, and alpha values in between are stretched towards 0.5 (using the slope parameter), making them more visible.
The output of this plugin should not be used for firther processing, but only for viewing.
The Matte Monitor is described in "Digital Compositing for Film and Video" by Steve Wright (Sec. 3.1).
See also the video at http://www.vfxio.com/images/movies/Comp_Tip_2.mov
version: 2
creator: mr.fantastic mrfantastic@firemail.cc
license: GPLv2
URL: https://openeffects.org/
title: Slope
description:
Slope applied to alpha values striuctly between 0 and 1.
type: float
readonly: no
required: no
animation: yes
minimum: 0
maximum: 1
default: 0.5
title: Top-Left Origin
description:
Set to 1 to use MLT top-left image origin instead of the OFX bottom-left origin. Use for plugins that crash or produce incorrect output with negative row bytes.
type: boolean
readonly: no
required: no
minimum: 0
maximum: 1
default: 0
widget: checkbox
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