On Sun, 13 Feb 2005 [EMAIL PROTECTED] wrote:
> that a movie media made of several layers does not have the same granularity
> (which does obably apply on classic still cameras as well).
> The blue layer seems to be made of bigger grains than other, therefore not
> having the same resolution.
> Having said this, is there a way to reconstruct the Blue from the chroma
> planes to apply a different set of processing / denoising ? or am I just
> dreaming it... :-)
You can reconstruct _a_ blue from the U and V planes but it won't
be the _original_ blue.
By the time you have a YUV4MPEG2 stream the RGB data has been converted
to "YUV". It's possible to convert YUV to RGB but there is some loss
involved in the process - and of course you'd have to convert back
again from RGB to YUV for encoding.
It sounds like what you want to do is process the RGB data _before_
going thru the pnmtoy4m (or ppmtoy4m) stage. Can't use y4mdenoise,
etc for that so you'd have to write your own filter - perhaps some
of the GIMP filters would be a good starting point since the GIMP
does a lot of its work in the RGB space.
The filters in mjpegtools are all oriented around "YUV" (with
various chroma subsamplings - 4:1:1, 4:2:0, and so on) rather than
RGB so if you want to treat each of R/G/B differently you'll probably
want to 1) do it before conversion and 2) write/borrow/adapt some
other code.
Good Luck!
Steven Schultz
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