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Re: IO Express HDMI out not working properly

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Re: IO Express HDMI out not working properly
by gary adcock on Oct 26, 2009 at 1:00:41 pm

[Jorge Torrens] "Hi Jeremy, yes I have true p originated material, I work mostly with Red originated files or panasonic 3000 and both in 24p or 25p."

First jorge.
understand there is a big difference between RED files which are 1080 true P and the Panasonic cameras which shoot P over interlace- these are NOT the same formats in the timeline.

[Jorge Torrens] " but for the dreamcolor the only one that has sense is RGB, as it needs to be driven by a true progresive RGB signal to activate the colorspace settings otherwise the monitor works in full range. "

your HDMI connection is always delivering a "P" signal regardless of the signal sent to it, you are correct that the output is progressive, but not always RGB, HDMI can be YUV or RGB as you not.


[Jorge Torrens] "or the program settings in fcp I use 1080p 24 and 25 fps settings in prores 422, and in nuke and fcp there are no timeline settings as suchs as the image is allways progresive RGB uncompress. "

NO it is not. FCP will always default to YUV color when outputting captured video. Your RED files would be converted to YUV in RED apps when you convert to 1080.

WHAT does the IoExpress/ Kona control panel say the video space is? not what you think it is- what does it SAY it is?

[Jorge Torrens] "I connected the Dreamcolor straight to the computer via a dvi->hdmi to check if it was the Dreamcolor HDMI input the culprit, and the levels look fine"
So you do not seem to think that the DVI connection could be doing anything to the signal?

There is a defined color space for the DVI output from the HDLINK that you seem to be forgetting about.
Since the HDLink device does allow for setting color space and lut info - how do you know that that process is not being used here.? Those settings are meant to compensate for the 8bit processing in the device.

a 10 bit signal should show more detail and by-passing any LUT's that are being used in the default mode on the HDLink.

maybe posting images would help us understand.




gary adcock
Studio37
HD & Film Consultation
Post and Production Workflows for the Digitally Inclined
Chicago, IL


http://library.creativecow.net/articles/adcock_gary/AJAIOHD.php




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