Re: FxPlug adding color cast.
Re: FxPlug adding color cast.
- Subject: Re: FxPlug adding color cast.
- From: Gabriele de Simone <email@hidden>
- Date: Tue, 13 Feb 2007 09:48:07 -0500
So is this true in all cases? In other words, the workaround to fix
it under FCP 5.1.2 would be to add 1 to the output whenever the plug-
in is asked to render in 8 bit RGB/YUV, on PowerPC?
Emile: the color shift is actually visible on the computer screen,
but it is understandably quite small so you'll catch it easily only
with bright scenes (e.g. a sky) or by building a passthrough filter
and keeping an eye on the scope and toggling the filter on/off.
On Feb 12, 2007, at 7:31 PM, Paul Schneider wrote:
Hi, all,
sorry I was silent on this topic - it somehow didn't come across my
radar.
This is in fact a bug in Final Cut, which only happens on PowerPC.
We've identified the problem, and a fix should appear in an
upcoming version. Sorry about the inconvenience!
- Paul
On Feb 12, 2007, at 7:10 PM, Dave Howell wrote:
Begin forwarded message:
From: Emile Tobenfeld <email@hidden>
Date: February 12, 2007 4:09:09 PM PST
To: Trevor Anderson <email@hidden>, Gabriele de Simone
<email@hidden>, email@hidden, pro-apps-
email@hidden
Subject: Re: FxPlug adding color cast.
At 3:29 PM -0800 2/12/07, Trevor Anderson wrote:
I found the problem. I logged the pixel data by running two
plugins,
one after the other. Final cut is decreasing all values by one.
If you
simply pass back the input values in the plugin, FC then
subtracts one
from them, after fixing this in the plugin, passing back the input
data plus one, the cast went away and everything works as expected.
Seems like there is a bug in there somewhere, and it's in Final Cut
after it gets the frame back from the plugin.
Thanks to everyone who helped me out, I'm glad it was this
simple, as
I really wanted to avoid the workaround.
Trevor
Good catch, Trevor -- though it sounds like the shift affects all
RGB colors and is not really a cast.
I'd noticed some 254's in my debugging code where I expected
255's , but had been too busy with other issues to dig further.
Dave, et al,
Can you comment on this. We don't really want to bump our input
values by 1 every time we are called.
--
"Now, here, you see, it takes all the running you can do, to keep
in the same place. If you want to get somewhere else, you must
run at least twice as fast as that!" -- The Red Queen
Emile Tobenfeld, Ph. D.
Video Producer Image Processing Specialist
Video for your HEAD! Boris FX
http://www.foryourhead.com http://www.borisfx.com
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