Swap

Swaps chroma channels in YUV clips.

Syntax and Parameters

SwapUV

SwapUV(clip clip)

Swaps U and V (chroma) channels. Corrects certain decoding errors – faces blue instead of red, etc.

UToY, VToY

UToY(clip clip)
VToY(clip clip)

Copies U or V chroma plane to the Y luma plane.

All color (chroma) information is removed, so the image is now greyscale.

Depending on the color format, the image resolution can be changed – i.e.,

with a YV24 source, UToY is the same width and height as clip, but

with a YV12 source, UToY is half clip's width and height.

UToY8, VToY8

UToY8(clip clip)
VToY8(clip clip)

Shorthand for UToY.ConvertToY8 and VToY.ConvertToY8, but faster. Added in v2.60.

YToUV

YToUV(clip clipU, clip clipV [, clip clipY ] )

Copies clipU:Y  to output U and clipV:Y  to output V.

If clipY is given, copies clipY:Y  to output Y; else output Y is 50% grey.

Depending on the color format, the image resolution can be changed.

Examples

• Blur the U chroma channel

video = ColorBars(512, 512).ConvertToYV12
u_chroma = UToY(video).Blur(1.5)
YToUV(u_chroma, video.VToY)
MergeLuma(video)

Color models

YUY2 and YV12 are supported. Starting from v2.60, Y8, YV411, YV16 and YV24 are also supported.