On Wed, 16 Jan 2008, Christian Ebert wrote:
> > Which says:
> > DV Color Correction - DV Luma Correction
> > DV Luma Correction has changed as of BitVice 1.4. If you create
> > video with iMovie, Final Cut Pro or other programs using the Apple
> > DV Codec, then check the DV Luma box. The Apple DV Codec
> > changes luma values when going from RGB to DV ...
> > Again, this is only for users of the Apple DV Codec.
> > That's the DV Color correction checkbox option.
Ok - two checkboxes. One is the Color correction one and the other
was called (in 1.4 and earlier) DV Luma Correction.
> Ermh, from <http://www.innobits.com/whatsnew.php>:
> |Minor GUI changes
> |DV Luma Correction changed to Use gamma 2.2 which is more accurate
> nomenclature
The name was changed and and the box is selected by default.
> |DV luma correction, is a filter for DV movies, which have gamma
> |1.8 as standard. This will make the resulting MPEG2 picture too
> |dark for TV. Check this box to correct that problem before
> |encoding QT DV movies. But use your eyes.
>
> [ the last sentence being my biggest trouble ;) ]
My biggest trouble is the first sentence (how do you know what
setting was used - I think 1.8 is uncommon/rare/obsolete) combined
with the default setting of 2.2. The default being 2.2 tells me
that the checkbox only exists for the (rare) case (probably
of an incorrectly built camcorder ;-))
> Sorry for being stubborn but I think you've got it the wrong way around.
Wouldn't be the first time.
My turn to be a bit stubborn - I don't think the setting is needed
or useful anymore and not something that mjpegtools has any use for.
The bug was (is? - may be fixed by now after all this time) when
Apple's DV codec was used to convert between RGB and DV. If you're
not doing that then don't worry about it.
> movtoy4m <http://homepage.mac.com/johan/mov/mov.html> speaks of a
> similar issue.
That's a bug in movtoy4m from my reading of the page. Unclear
if it was in the ffmpeg libraries or introduced by movtoy4m elsewhere.
Haven't done much with DV since 2006 but that movie came out fine.
Cheers,
Steven Schultz
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