[Jorge Torrens] "My problem is exclusively with the black levels out of the HDMI output of the Aja IoExpress, and I'm seeing the problem irregardless of where the material originated or the application I'm using.
I see the wrong levels in:
YUV originated material, AVCIntra panasonic in FCP and color
RGB converted to YUV, RED to prores in FCP and color
RGB native, computer generated gradient in nuke
RGB native, Red r3D in nuke and color
"
Jorge,
your english is excellent.
I understand that you are not seeing Black Levels that you expect- have you looked at a waveform or vectorscope to check the signal from the source?
You are trying to match to something that may or may not be changing your video-out signal via the HDLink and any of those things can affect the output. There are LUT's for the HDLINK converter. ( look up tables- files that change the nature of a signal being played)
1) The DreamColor is NOT a video display, it is a computer display that can handle a video signal.
2) Do NOT use the FULL RANGE for HDMI- the default is SMPTE for a reason.
You cannot call something RGB because you think it is- the HDLINK is converting YUV video to RGB via some unknown factor- it is conforming your video to the 709 color space and then to RGB for the HDMI to the DreamColor settings as REC 709- you have no choice in this if you are trying to use this computer monitor as a video monitor.
3) RGB signals are traditionally DUAL LINK HDSDI- if you are trying to send RGB over a SINGLE cable of HDSDI this is the first place to start.
4) Video is by it's nature a YUV (Y'Cr'Cb' in HD) signal.
5) Depending on how the RED footage was converted it is YUV within the REC 709 Color space. Your Panasonic 3000 footage is always YUV and 1080 Psf.
OK I took My Io Express and sent a 1920x 1080 ProResHQ file of the ASC's StEM demo footage and set it up so that I could simultaneously view 3 different sources via Component to a Panasonic 17' display, via HDMI to a HP Dreamcolor and using the HA5-3G converter (HDSDI- HDMI) from the HDSDIO output to my Sony Bravia XBR client monitor direct out of the IoExpress.
I do not see any difference between the signals, and my Tektronics scope confirms my visual inspection, but I do not have a HDLINK to test this on, but I am not seeing the differences you describe in the signal output with my tests.
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
