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Author Topic: Barco Color Calibration Phil Ranucci Expert Film Handler Posts: 236 From: Carpinteria,CA, United States Registered: May 2006 posted 04-27-2015 12:51 PM                     Question about calibrating color on Barcos. After measuring native colors and applying the correction, we selected color verification as the target color source and verified the corrected colors and white was spot on. But a white test pattern called up on the Barco (corrected or uncorrected} was way off. If we ran the GDC framing chart the white was correct. What am i missing? I thought test patterns were stored on the ICP board which also does the processing, so why isn't white white? Thanks!  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 04-27-2015 01:00 PM                     If you are calling the white (or any other pattern) via the Test pattern section of communicator, it is likely that the TCGD is no longer Color Verification and that you are now reading via the TCGD buried in the PCF for the format that is selected. Note, officially, color is supposed to be read by playing an appropriate pattern from the SERVER not the projector. That would ensure that the entire signal path is accounted for. Does anyone do that outside of 3D? Probably not too many though it is easy enough to do the verification that way.  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 04-27-2015 02:49 PM                     You can get a white pattern dcp from freedcp.net. When projected it should read 0.314/0.351 after calibration. Just play it and pause, it will project white until ejected. This is good for 3D as it will run your 3D adapter at sync speed.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 04-27-2015 03:16 PM                     Note, anyone that has access to Dolby's customer site can download their 3D test patterns so you can get all four stimuli. They will work for 2D or 3D color tests.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 04-27-2015 03:34 PM                     I use the internal patterns but always verify via server. As Steve says that accounts for everything. Also I found that white from server is usually slightly less bright than white from projector.  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 04-27-2015 03:57 PM                     White patterns are basically uncorrected color. You can't add more green to the colors so to get that you turn down red and blue... corrected color will always be a bit less bright than uncorrected - unless by some miracle the uncorrected color reads 0.314/0.351.  |  IP: Logged Justin Hamaker Film God Posts: 2253 From: Lakeport, CA USA Registered: Jan 2004 posted 04-27-2015 03:59 PM                        I'm not certain with the Barco projectors, but with the NEC projectors, you have to load the test pattern, then apply the various screen filed - Lens, Screen, MCGD, etc.  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 04-27-2015 11:50 PM                     Dave, what I meant was that the white corrected from the server reads slightly less bright than the white corrected from the projector. Not a huge amount. Obviously there is a big difference between corrected and uncorrected, as you said.  |  IP: Logged Ian Freer Expert Film Handler Posts: 135 From: Wellington, New Zealand Registered: Oct 2003 posted 04-28-2015 12:21 AM                     I've noticed the same as Marco; If I put up a corrected test pattern from the projector (MCGD applied and the Target set as Colour Verification), I get 314 x 351 at X fL. Then play the Dolby FS White from the server, I still get 314 x 351, but at about 2fL less than directly from the PJ. Is there a particular reason that anyone is aware of for this?  |  IP: Logged Marco Giustini Film God Posts: 2713 From: Reading, UK Registered: Nov 2007 posted 04-28-2015 06:37 AM                     I thought it was less than 2fL but it may be. I believe there is a contrast control in the ICP, never played with that. But it would make sense for the FS patch from the server to provide the same value.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 04-28-2015 07:01 AM                     Justin...for the NEC projector, I suggest you acquaint yourself wit the TI ICP/Enigma program. You can then apply the test pattern via the TI program and not have to put up with NEC's quirk of always popping you back to full-screen. In fact, I find myself using the TI program for setting screen files and sometimes MCGD files too.  |  IP: Logged Justin Hamaker Film God Posts: 2253 From: Lakeport, CA USA Registered: Jan 2004 posted 04-28-2015 11:55 AM                        Thanks for the tip Steve, I will try that next time I work on my screen files.  |  IP: Logged

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