Home - Light Developer - Help - Matting - Chromakey matting

If the image meets the following condition, it can be processed by the chromakey matting.

• the background are pure color.
• the color is not black, white, gray, but a color with saturation
• the color does not exist in foreground object.

A typical image that needs chromakey matting is a photo taken in front of a ‘Blue’ or ‘Green’ background.

The usage is simple, use the color picker tool to click on the background, then the program will calculates matte for you. There are several parameters,

• Feather 1 pixel: Add 1 pixel feature on the outputting mask.
• Optimize edge: Make mask on edge more accurate.
• Reduce related color: Some time, the background will reflect its color on the foreground. For example, if a person wares a white cloth, stand in front of a blue background. The light of blue may tint the cloth to blue. This will cause a semi-transparent on cloth. This option can reduce the effects.
• Curve box: Adjust mask after matting. It is the curve for mask that follows the general curve operation. Referring to the histogram of the mask, it can make the result more clear. Like this figure show,
  

When the matting result have defects, you can use ‘General tools for matting’ to refine them.