Re: [Avid-L2] Illegal levels clip fine with Safe Colors but don't clip UPON RENDER

My BCC AVX is 8.1.1.1041 - I believe that's the latest. I just tested -
with all of the effects (Avid Safe Color, BCC Color Correction, Symphony CC
clamp), in 8-bit, 16-bit, or Automatic, the problem still occurs.

I do want to make it clear: I'm parsing this with as fine a tool possible.
If you're casually looking at the waveform, the clamping works. It's not
that it comes undone. Rather it's this: perfect, sharp, clamps unrendered;
fuzzy clamps post render.

Thanks for the suggestions.


On Tue, Feb 5, 2013 at 1:55 PM, Dirk de Jong <dirkd@borisfx.com> wrote:

> Are the effects set to render in 16bit color depth ? I believe that
> previews (unrendered effects) are always 8 bit and this sometimes
> partially explains discrepancies between unrendered and rendered
> effects. That said, it should generally match pretty well.
>
> I see you are on Symphony 6.0.3 Mac. How about the BCC version ? If
> you don't have the latest update it might be worth downloading and
> installing that. Among the BCC fixes listed in the 8.1.0 release notes
> here [
> http://www.borisfx.com/borisfxwiki/index.php/Continuum_Complete_AVX_8.1.0_Release_Notes
> ] it lists
> "• Fixed color clamping and posterized colors when Safe Levels is off
> in 16bit renders." so it sounds like there are some fixes pertaining
> to the levels of 16bit renders
>
> BCC updates can be downloaded by going here ;
> http://www.borisfx.com/updates/
> and clicking the link for "Continuum Complete AVX" and logging into
> the site etc.
>
> re-reading your message it sounds like you are seeing the same thing
> with the Avid effect as well so maybe that's not the issue here...
>
>
>
> On Mon, Feb 4, 2013 at 8:13 PM, Mark Spano <cutandcover@gmail.com> wrote:
> >
> > Hi folks,
> >
> > Here's a new one for me. Take any clip that has a few bits of information
> > below 0mV or above 700mV (luma, R, G, B, whatever). For example, here's
> an
> > external scope view, where everything green is above 0 and everything red
> > is below 0:
> >
> > http://i.imgur.com/rp94vzB.jpg
> >
> > Knowing that the particular clip in my edit would be fine to crush a
> bit, I
> > figure I'm fine with just dropping a Safe Color effect on to clamp at 0.
> > Using either the Avid Safe Color Limiter effect, or the Boris Color
> > Correction effect with Safe Colors checked, when I drop either one onto
> the
> > clip in my timeline, I get the desired result, which looks like this:
> >
> > http://i.imgur.com/jKh4Cxg.jpg
> >
> > I've got it set to clamp at 0mV low luma, 700mV high luma, and even
> 16/235
> > for my RGB. It does a PERFECT clamp across all my luma (as you can see)
> and
> > RGB channels, which is what I'm looking for.
> >
> > Now here's where it gets weird. If I render/mixdown/export, it still does
> > the clamp, but misses a lot of stuff! In this case, it ends up looking
> just
> > like the clip without the effect:
> >
> > http://i.imgur.com/rp94vzB.jpg
> >
> > WTF? This happens with stuff going on above 700mV too.
> >
> > Upon further testing, it appears that any of these effects work
> flawlessly
> > when you drop them in, but when rendered, they miss some stuff. If you
> > clamp without rendering, and park on an offending frame, zero alarms will
> > go off on the scopes. But as soon as you play/render/export/mixdown, the
> > effect goes from being precise to being approximate.
> >
> > This happens with almost any clip (AMA, native DNxHD, etc.), on every
> > system I have (Mac, Symphony 6.0.3.2) and user setting I have (new
> > included). I feel like it's better with progressive material than
> > interlaced. I wouldn't even mind it so much, but the unrendered effect is
> > PERFECT. But what good is that, when it stops being perfect on playback,
> > render, export, or mixdown?
> >
> > I am sufficiently boggled by this. Anyone else see this happening? To be
> > clear, I am talking about TINY infractions. But the pre-rendered effect
> > gets the outliers - that's the stumper.
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> > ------------------------------------
> >
> > Search the official Complete Avid-L archives at:
> http://archives.bengrosser.com/avid/
> > Yahoo! Groups Links
> >
> >
> >
> >
>
>
>
> --
> Dirk
> BorisFX
> dirkd@borisfx.com
>
> Things are not as they appear.
> Nor are they otherwise.
> - Lanka Sutra
>
>
> ------------------------------------
>
> Search the official Complete Avid-L archives at:
> http://archives.bengrosser.com/avid/
> Yahoo! Groups Links
>
>
>
>


[Non-text portions of this message have been removed]



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