Re: gamma curve applied in fcp when jumping around the timeline
Re: gamma curve applied in fcp when jumping around the timeline
- Subject: Re: gamma curve applied in fcp when jumping around the timeline
- From: Paul Schneider <email@hidden>
- Date: Mon, 1 Oct 2007 12:16:53 -0400
Hi, Ben,
there shouldn't be any difference in gamma between our RT display
path and the render-to-file path, at least in the common case of
YUV@2.2 footage in a YUV@2.2 sequence.
There might be some issues with an RGB still in a YUV sequence.
Final Cut treats RGB stills as if they had a gamma of 1.8 by default
(although you can change this in the Item Properties). It's possible
that there is an inconsistency here, although I'm not aware of any
specific issues.
If you want, you can send me your project and linear ramp image, and
I can take a look.
Thanks,
- Paul
On Sep 28, 2007, at 11:45 AM, Benjamin Kent wrote:
Hi,
I may be going mad, but it appears that the image data I get in an
FxPlug plug-in when jumping around the timeline in FCP is different
to when I render a sequence - it appears that it has been through a
slight gamma correction (although nothing as extreme as sRGB).
To verify this I dropped a linear ramp image into my timeline -
zero on the left and full white on the right. Plotting the
intensity from left to right inside the plug-in yielded a curve
when jumping around the timeline, but a straight line (as expected)
when rendering the sequence.
Is this expected behaviour - maybe something to do with FCP
correcting for the display? If so, is there a way to know if the
data you're getting has been corrected, or whether you're in a render?
Thanks
Ben
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