Swap

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.

YToUV

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

Copies the Y (luma channel) of clipU to the U channel of the output clip and the Y (luma channel) of clipV to the V channel of the output clip.

If clipY is given, copies the Y (luma channel) of clipY to the Y channel of the output clip.

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

• Blur the U chroma channel

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

• Show U and V channels stacked for illustration purposes.
  • Note that with a YV12 source (like the one below), the U and V images will be half the size of the original.
  • In the U and V images, gray will be at 128 and colors will be either brighter or darker.

StackVertical(
\  Subtitle("YV12 original", align=2),
\  StackHorizontal(
\       UtoY.Subtitle("UtoY", align=2), 
\       VtoY.Subtitle("VtoY", align=2)
\  )
\ )