ShowAlpha
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Revision as of 19:20, 5 August 2014
ShowAlpha(clip clip, string pixel_type)
ShowBlue(clip clip, string pixel_type)
ShowGreen(clip clip, string pixel_type)
ShowRed(clip clip, string pixel_type)
ShowAlpha shows the alpha channel of a RGB32 clip, available in v2.53. ShowBlue/ShowGreen/ShowRed shows the selected channel of a RGB clip, available in v2.56.
In v2.54 ShowAlpha now 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/Blue now 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 channel 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. |
todo: add Y8 as pixel type
