Chroma Key allows you to set a portion of the selected Media Layer to transparent, based on color. It is used for green-screen style effects, as well as other special effects. Chroma Key has the following settings.
Enable - Toggles the Chroma Key tool On and Off.
Foreground Cutoff - The threshold above which everything is considered part of the foreground. This determines what is preserved.
Background Cutoff - The threshold below which everything is considered part of the background. This determines what is removed based on the Key Color.
Key Color - The color that is removed from the screen. You can select between preset colors or select your own.
Detail Curve - Adjusts the blending levels between the foreground and background cutoff. Generally, curves that pull towards the lower-right corner will remove more of the background color at the expense of a sharper edge on the mask. This only needs to be adjusted if it’s not possible to get satisfactory blending on the edges.
Show Mask - Shows the level of transparency for the selected item. Areas in white are fully transparent, while areas in black will be visible on screen.
KineMaster Tip: Chroma Key Best Practices
The KineMaster Chroma Key tool is very powerful. Using the following tips will get you even better results.
The recommended process is:
1) Turn on mask mode
2) Drag the foreground slider down until the foreground is pure white with no holes
3) Drag the background slider up until the background is pure black with no noise.
The further apart the Background and Foreground Cutoff sliders are, the softer the edge of the mask, but the more of the Key Color you can see on the fringe.
The best results are achieved by selecting a key color that is a super-saturated version of the background color (rather than the actual background color). This ensures the key color is far away (in the UV color plane) from other colors, so you don't get accidental drop-outs of other similar colors. KineMaster will automatically select a super-saturated version of the most common color in the scene as the key color, and usually this is correct, and you don't need to change it. Note that black and white are not advised as key colors.