10 Jun
2015
10 Jun
'15
11:19 a.m.
Am 09.06.2015 um 23:55 schrieb Carl Hetherington via DCPomatic:
Thanks for these. The Kakadu sample has an extra
resolution layer (7
instead of OpenJPEG's 6) according to j2k_dump. I'll have a look in
more detail at some point.
Yupp, that's what J2Cviewer also tells me.
The problem is that the J2K encoding has so many options and all the descriptions I found
do not converge to the same terms.
The OpenJPEG documentation e.g. does not state 'resolution layer', the only
potentially mathcing parameter I found within the DCI profiles could be 'Wavelet
transform levels' - that is quoted as 'max 5' for 2k, and 'max 6' for
4k.
Then there is 'tile parts', which is 3 for 3 2k color components in 2k, and for 4k
it is 6, for 3 color components for 2k and another 3 for the 4k components. Wondering then
why Kakadu uses 7, and then why the Doremi even tries to use 7 (and successful)?
Well, that's probably to special for the mailing list, but in case someone with more
knowledge reads this...
- Carsten