Changing video or movie background

hi,

i have got some help file which could help you

Transparency effects such as chromakeying and lumakeying can be easily applied to a clip through the transparency menu ? clips>video>transparency, which opens the window shown on the right.

The first thing to do is select your key type. Chromakey allows you to select any single colour you wish, and also set the similarity, blend, threshold and cutoff settings, using the preview in the top right corner to find the settings to produce the best result. Lumakey removes all areas which are brighter/darker (depending on settings) then the threshold. The various alpha matte keyers, remove areas of the picture as indicated by the image's alpha channel.

An alpha channel is an extra grey-scale image attached to the visible picture, and parts of the visible picture are made transparent depending on the brightness of the grey-scale alpha channel.

The difference matte keyer is an interesting option, which compares the current frame of video with a separate picture (intended to be a picture of the background from the movie). Any part of the picture which is the same in both images is made transparent. This allows keying effects without use of a chromakey screen, but results are not necessarily of the highest quality hi, i have got some help file which could help you Transparency effects such as chromakeying and lumakeying can be easily applied to a clip through the transparency menu ? clips>video>transparency, which opens the window shown on the right. The first thing to do is select your key type. Chromakey allows you to select any single colour you wish, and also set the similarity, blend, threshold and cutoff settings, using the preview in the top right corner to find the settings to produce the best result. Lumakey removes all areas which are brighter/darker (depending on settings) then the threshold. The various alpha matte keyers, remove areas of the picture as indicated by the image's alpha channel. An alpha channel is an extra grey-scale image attached to the visible picture, and parts of the visible picture are made transparent depending on the brightness of the grey-scale alpha channel. The difference matte keyer is an interesting option, which compares the current frame of video with a separate picture (intended to be a picture of the background from the movie). Any part of the picture which is the same in both images is made transparent. This allows keying effects without use of a chromakey screen, but results are not necessarily of the highest quality