2011/6/28 Hans van der Meer <h.vandermeer@uva.nl>

> I would be pleased to get some advice from "color-knowledgeable people" on
> the following matter.
>
> In TV-broadcasts there are usually two kinds of subtitles present: Teletext
> as characters and DVB as pixels. These can be extracted and rendered with
> Metapost. I have done this, but I am not very satisfied with the colors
> produced. On the television screen they look bright, when rendered in
> Metapost they are dull and muddy. The text is barely readable.
>
> As I am fairly sure I did extract the correct bits from the CLUT contained
> in the stream, I wonder if I am doing something not right at the Metapost
> side. In the datastream the values given are the most significant 6, 4, 4
> and 2 bits of respectively Y, Cr, Cb, T. These are scaled to the values
> given to Metapost by dividing them by 255.
>
> In the zip one finds the program (ConTeXt MKIV) used for typesetting, an
> example pixel map with clut, and the output. I would be obliged to get some
> comments.
>
>
> have you already seen
 http://en.wikipedia.org/wiki/YCbCr
?
-- 
luigi