Billy responded:
> At some point, someone has to convert from 4:1:1 to 4:2:0. Linux
>tools currently seem to simply duplicate chroma samples horizontally and
>drop vertically, resulting in poorer colour than could be achieved with
>a better filter. Test images to show problems would likely have jagged
>blue or red edges.
Ouch.
> Ok I see what you mean. We discussed this before about how to
>properly cut it off. So, let's say I'm trying to get rid of the setup.
>Should I record at like 768x480 and then estimate where the setup ends,
>and then resample the active area with 720 samples ? I can't see how to
>do this though without messing up the aspect ratio of the content.
Setup is not an aspect ratio thing. You have to do a levels adjust. From
within Adobe Premiere, I have been using a value of 14 in the first box.
This means that any pixel that is at 14 is stretched to 0. The process is
a stretching, not a shift, of the video level. Anything at 255 is left at
that level.
MB
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