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

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


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