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DPX to Prores 4444 - footage go's really dark during log to Lin conversion


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#1 Phil Thompson

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Posted 10 February 2011 - 06:56 AM

Hi there,

I shot some 35mm got a dpx sequence on hard-drive, opened color brought the footage in - changed header to Log and now it shows up really dark when I export to prores 4444 Is this normal? Do I just edit the dark pro res and then go back to the light Log space at the end?

So confused.

Please help
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#2 Robert Houllahan

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Posted 10 February 2011 - 02:24 PM

The Original DPX frames at LOG you should grade them in the LOG mode then if you want to export to 4444 I think you can do a conversion setting for Rec709.

-Rob-
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#3 Phil Thompson

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Posted 10 February 2011 - 02:38 PM

Hi Rob,

I dont want to grade them, just want to edit it, thats why im bring the dpx sequence into color just to export as pro res 4444 to edit in FCP. Is this correct? And why does it make the footage look all contrasty and dark when its in linear space?
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#4 Robert Houllahan

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Posted 10 February 2011 - 05:06 PM

Hi Rob,

I dont want to grade them, just want to edit it, thats why im bring the dpx sequence into color just to export as pro res 4444 to edit in FCP. Is this correct? And why does it make the footage look all contrasty and dark when its in linear space?



It is contrasty and dark because the footage is originally in LOG you can render the DPX frames directly to ProRes4444 in Color and then bring them into FCP to edit without doing a LOG -> LIN conversion and they will look right. I have a music video I am editing right now which was shot at Coney Island on S16mm and 2K scanned. I graded the footage as 2K LOG in Color and rendered as 2K ProRes4444 and I am editing it in FCP right now. I have made DVD's and H264's from FCP of this footage and it looks fine.

The color footage in this video I did went through this work-flow:

http://www.npr.org/b...ost-woman-blues

-Rob-
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#5 Phil Thompson

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Posted 11 February 2011 - 04:41 AM

Hi Rob,

If I export from color a prores 4444 file from my dpx sequence in LOG space then for some reason the Quicktime comes out pure WHITE.
Any idea why this would be??? Thats why i transfered it to LIN.
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#6 Robert Houllahan

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Posted 11 February 2011 - 08:35 AM

Huh I don't know? Let me load some dpx frames into color and see if I have the same problem. I am using Resolve now but have Color on that machine...

-Rob-
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#7 Chris Burke

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Posted 11 February 2011 - 09:57 AM

what does Apple say? Do you need to go back to the DPX files? If not, try using compressor or Graphics converter to get a QT 4444 file. When exporting from either, make sure that the gamma correction is shut off.
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