Re: FxPlug adding color cast.
Re: FxPlug adding color cast.
- Subject: Re: FxPlug adding color cast.
- From: Emile Tobenfeld <email@hidden>
- Date: Mon, 12 Feb 2007 16:27:48 -0500
Hi Gabe (and Trevor)
Is this color shift only seen on NTSC out? I'm not seeing it on my
computer screen.
At 3:49 PM -0500 2/12/07, Gabriele de Simone wrote:
Hi Trevor,
I can confirm your findings, and offer a workaround. That color
shift is only there during 8 bit RGB or YUV processing. If that's
all your plug-in supports, then you're out of luck. But if you can
write your plug-in to support floating point rendering, the unwanted
color shift will not be there when you are *rendering*, as long as
the "Render all YUV material in high-precision YUV" setting is ON in
your sequence setting.
Even if your plug-in supports 32 bit float rendering only in RGB,
you will still benefit from that the "high-precision" option, since
FCP appears to do the float YUV to RGB conversion for you.
Obviously, if you plug-in supports 32 bit YUV rendering ('r4fl')
you're in the best position for limiting the damage.
As a side note: the sequence setting only affects rendering, so
there's no way to get rid of that color shift during preview. You'll
have to document this fact with your users...
Gabe
Noise Industries, LLC
On Feb 12, 2007, at 2:04 PM, Trevor Anderson wrote:
I'm relatively new to FxPlug programming, but I did notice something
strange. It seems that in Final Cut, it reduces the red and blue
channels in my image giving it a green color cast. Once I noticed
this I stripped the plugin down and found that even when I simply send
out exactly the pixel values it sent in to me, it still does it. It
does it whether I ask for RGB or YUV. If I switch codecs in Final Cut
to something like Video, then it doesn't do it, but if I'm in any of
the DV codecs, it does. Is this a QuickTime bug? Something to do with
color space conversion on rendering? Any help or suggestions would be
appreciated,
Trevor
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--
"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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