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Author Topic: Dolby Digital print issue Antonio Marcheselli Phenomenal Film Handler Posts: 1260 From: Florence, Italy Registered: Mar 2000 posted 11-21-2003 09:17 PM                        I found on one of my matrix print that error rate was at 6.5 and I checked the print for damages. No physical damages but a brown area that was coming in and out from the perf area. I was able to take a picture of the issue (while projecting, I still have to understand how it was possible, since the camera is a cheap digital one!) and you can see the brown area that is disturbing the DD area. I was just curious what can create a problem like this during print  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 11-21-2003 09:29 PM                     That's amazing your camera caught that during projection. What does that reader normally track at? What do the other reels in that print track at? I'm betting that is not the cause of your problem, but I'm sure John Pytlak can explain where the marks come from in printing.  |  IP: Logged Antonio Marcheselli Phenomenal Film Handler Posts: 1260 From: Florence, Italy Registered: Mar 2000 posted 11-21-2003 09:41 PM                        Brad I have to say that I didnt' had time to check the error rate of the other parts, I just know for sure that the sound is not reverting! However, I'm sure that I have no problem with the reader. Usually all of my machines with good prints reach 1/1. with no problems. I'll check tomorrow what happen with the other reels. Oh, Brad. I forgot to say that the brown area reached the center of the DD data at the maximum "extension". It is cycling but continuous. Bye A  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 11-21-2003 10:06 PM                        Looks like a very low level of fogging, possibly from light, pressure from a sprocket tooth, or static discharge. From the photo, I would be surprised if it was causing the increased error rate.  |  IP: Logged Mark Hathaway Film Handler Posts: 31 From: Australia Registered: Nov 2001 posted 11-21-2003 10:10 PM                     Hello Antonio, if you say there is no physical damage, then possibly the damage originates from the lab. Victoria 5's are know to scratching the film around the perforations when dirt is allowed to build up in the keeper rollers, etc. Is the projector clean?  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 11-21-2003 10:49 PM                        I wouldn't be surprised at all if it was causing higher error rates. The right most complete block is awfully dark on the left side.  |  IP: Logged Antonio Marcheselli Phenomenal Film Handler Posts: 1260 From: Florence, Italy Registered: Mar 2000 posted 11-22-2003 07:45 AM                        Daryl, Yes, and there was not the worst moment. As I said the dark part reach the center of the data. John Thanks. Why the brown marks couldn't increase the error rate? It is a darker area in the datas... How can static create a problem like this? Mark, Of course it is clean... I clean it once a year. Bye A  |  IP: Logged Michael Schaffer "Where is the Boardwalk Hotel?" Posts: 4143 From: Boston, MA Registered: Apr 2002 posted 11-22-2003 02:10 PM                        Does the camera even see that brown stuff?  |  IP: Logged Antonio Marcheselli Phenomenal Film Handler Posts: 1260 From: Florence, Italy Registered: Mar 2000 posted 11-22-2003 07:41 PM                        What camera, Dolby one or the camera I used for the photo? Bye A  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 11-23-2003 08:11 PM                        From the photos, the marks appear to be mostly in the yellow. If you have a red LED reader, it would not "see" the yellow dye. Even a white light reader would get most of its signal from the other layers. In color print film, the yellow layer is the fastest, and most sensitive to "seeing" any static discharge.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 11-23-2003 08:23 PM                     I too noticed that same thing at a theatre just south of SLC. Same high error about 6 to 6. on the DA-20 with BACP reader and also never reverted and had basically the same type of marks at the sprockets and I just accorded that the lab slipped up on this one a bit. Since it never reverted and the theatre was going to be retiring the print in a DTS house for the remainder of the run at its complex I didn't think much of it. The machinery in this case was a DP-70. Mark @ CLACO  |  IP: Logged John McConnel Expert Film Handler Posts: 118 From: Okmulgee, OK USA Registered: Nov 2003 posted 11-23-2003 09:34 PM                        One reel of SEABISCUIT last summer came with a faulty Dolby Digital track. It was a lab problem, as one edge of the Dolby image block was blackened. We didn't have our system set to revert, so we caught it immediately. The replacement reel was fine and I cut samples from each reel to compare. We also had problems on LEGALLY BLONDE 2, which we didn't open on the break. The previous theatre had run it off sprocket, and ruined the Dolby Digital track. We spoiled one Dolby Digital track ourselves, on RADIO. The damage was caused by a defective roller on the upper feed sprocket pad roller assembly on a Cinemeccanica V-18. It put tiny scratches in the center of the Digital image block, and on the second showing, the system reverted. Soft emulsion may have also been a contributing factor, as trailers weren't damaged. Removing the defective roller has contributed to maintaining a lower error level on all succeeding prints. Error levels which had ranged up to 5 and 6 by the end of a run are now 3 to 4. I'm still looking for other causes of track degradation.  |  IP: Logged Dean Kollet Jedi Master Film Handler Posts: 591 From: Florida State University Registered: Jul 2003 posted 11-25-2003 08:50 AM                     maybe I am the only one...but doesn't anyone find that amazing how he got that shot (assuming that the projector was running). I have an expensieve digital camera, and that's a hard shot to take. Hell, that's a hard shot to take with a nice SLR camera...there is no indication of the film even moving...Nice Job Antonio, you may want to consider a profitable hobby :-)  |  IP: Logged Antonio Marcheselli Phenomenal Film Handler Posts: 1260 From: Florence, Italy Registered: Mar 2000 posted 11-25-2003 11:23 AM                        Dean I was just Lucky... I made 10 shots, 9 of them was bad! However, thanks! A  |  IP: Logged Steve Scott Phenomenal Film Handler Posts: 1300 From: Minneapolis, MN Registered: Sep 2000 posted 12-03-2003 10:26 AM                     Our print of Narc had four seconds of film, in the middle of a reel, that looked as if it had fallen out of the printer because all of the soundtracks skewed into the main image... I haven't seen anything that bad since, but I do get quite a few trailers (esp. Coke) that have the Dolby Digital data half shaded out (i.e. printed sprocket holes instead of data)  |  IP: Logged

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