Chroma Key: FAQ

This is a faq page about chroma key, which is available with Vision Mixer SDK, Video Mixer DirectShow Filter or the Chroma Key DirectShow Filter.

What is delta? What is chroma key additional delta? When I make changes in this RGB values, No changes in output. pit> At what situation I can use this option? pit> 3. When I set maximum value in "Erode" and "Smooth Edges" option, pit> the output window starts flickering. pit> How can I avoid this?

The croma-key works by the following algorithm. The colors inside the ellipse with center point R,G,B (value) and axis (dR,dG,dB) (delta) inside color cube (with R,G,B axis) assume as transparent. (let be ellipse 1)

'Smooth edges': mean smooth the edges of not-transparent areas. 'Erode': decrease (erode) not-transparent areas.

Anti-spill correction: 'From borders': The chroma value for pixels near the borders of not-transparent area decreased. 'Additional delta': For colors inside the ellipse R+dR+dR2, G+dG+dG2, B+ dB + dB2 (the ellipse 1 inside this bigger ellipse) chroma value decreased. 'Highlight Anti-Spill areas' : The arias for which ant-spill correction performed highlight by green color.