The quality of the produced key is highly dependent on:
the green screen
the position and clothing of the talents
The video keyer is an easy-to-set-up real-time chroma keyer that you can use to key your video input.
the camera system setup matches the physical camera
the camera system is routed to the correct machine
Go to PRODUCTION > Adjust > Video Keyer
Select the camera system
Click "Enable Video Keyer"
Position a talent or a stand-in person on the stage, or else use a dummy model with hair, as well as a water bottle to set the transparency
Click "Initialize key"
Director grabs one image of the video feed.
Draw on the image to select which colors are background and should be keyed out
These are typically the flat green values - do not select the dark greens on the floor if you wish to get contact shadows.
It usually only needs a couple of strokes
If you want to recapture the image, just click "Capture new frame"
To delete all strokes use the "Clear" button
Select "Send key to video output" to examine the result
Refine the initial key by selecting more colors. Keep monitoring the results and repeat several times where needed
Click "Close" when you are happy with the initial key
Refine the parameters to improve the key
Zoom in tight on the head of the model, and adjust the focus so that the hair is clearly shown. Then zoom back out again without adjusting focus
Don't forget to turn off "Send key to video output" when you are happy with your key.
In the Editor
Click the "Utilities" tab
Click Input video > Raw
Turn on Alpha
Turn off the Red, Green and Blue channels
Select Keyer Model
There are 2 keyer models available:
Chroma-PX1: legacy keyer present in Pixotope 1.5
Chroma-PX2 (default): new keyer using a more advanced color model with more precise color extraction and sharper alpha mask
With "Automatic Clean Plate Generation" enabled and "Add Luma Key" being used, the reference is automatically generated from the locally closest backing color.
Increases the domain of the selected background colors.
Increases the domain of the foreground.
Maintaining a good distance between the Background and Foreground sliders will ensure a good soft edge on the key.
Add luma key
Adds to the key based on the pixel luma value.
This can help to fill in regions of a soft foreground region.
Adjust Key Color Intensities
Red, Green and Blue
Allow adjustment of key intensity based on RGB pixel value to make red “repel” or be “insensitive” to keying, for example.
This is especially useful for preserving colors that are close to green, e.g. yellows. To preserve cyans, you have to reduce the blue intensity slightly.
To adjust the alpha mask from the internal keyer.
Controls the gamma correction of the key.
Controls the gain of the key. 1 is the default and larger values increase the gain.
Controls the tightness of the alpha mask. A higher value results in a more eroded mask. This is a sub-pixel erode control.
Controls the strength of the effect. Increasing the level will help to include more details in the soft edges.
Edge Luma Correction
Controls luma range on despilled area - this blends back the original luminance value of the edge pixels, rather than using the luminance of the background pixel - carefully controlled, this will blend the edges in better to the background.
The Shadow controls allow you to add shadows that exist on the evenly lit backdrop.
Controls the intensity of the key in the shadow areas. A value of zero gives no shadows - set a subtle value to get believable soft shadows.
Adjusts the depth of the shadows that are generated. The default is 100%.
The Despill controls allow you to vary the background color removal from the foreground, adjust the foreground color range that is despilled, as well as allowing you to adjust the hue for the areas containing the spill.
Controls the strength of the effect. The default is 100% with full despill. Reduce the value to see if other colors than the background are being despilled as well.
Controls the range of colors that are despilled by color distance from the original background picked color. For example, yellow and light blue may also be despilled by default. Adjusting the Cutoff can exclude both colors from the despill range and so preserve the original foreground colors.
Changes the hue of the despilled area.
Hue changes the hue angle of the range of the despilled colors. Use with care to preserve skin tones - it is generally better to use the Cutoff control rather than the Hue to preserve the original foreground colors.