ShowAlpha (clip, string pixel_type)ShowBlue (clip, string pixel_type)ShowGreen (clip, string pixel_type)ShowRed (clip, string pixel_type)
ShowAlpha shows the alpha channel of a RGB32 clip, available in v2.53. ShowBlue/ ShowGreen/ ShowRedshows the selected channel of a RGB clip, available in v2.56.
In v2.54 ShowAlphanow returns RGB, YUY2, or YV12 via the pixel_type argument. The latter two can be used to layer an RGB clip with alpha transparency data onto a YUV clip using the 3-argument form of Overlay, because when setting pixel_type to YUY2 or YV12 the luma range is [0,255].
In v2.56 ShowAlpha/Red/Green/Bluenow returns RGB24, RGB32, YUY2, or YV12 via the pixel_type argument. For RGB32 output the selected channel is copied to all R, G and B channels, but not the Alpha channel which is left untouched. For YUV output the selected channel is copied to the Luma channel, the chroma channels are set to grey (0x80).
Examples:
# shows alpha channels of clip
AviSource("clip.avi")
ShowAlpha() # swaps red and blue channels:
AviSource("clip.avi")
MergeRGB(ShowBlue("YV12"), Last, ShowRed("YV12"))Changelog:
| v2.56 | added ShowBlue, ShowGreen and ShowRed |
$Date: 2005/07/08 22:53:16 $