Correct me if wrong, but isn't the IRE level more relevant to the LD player than the disc? Therefore if your using a Japanese LD player then your IRE level should be set at 0, not 7.5. This would account for the lighter blacks.
Elvis
| LaserDisc Database https://forum.lddb.com/ |
|
| Bluish blacks? https://forum.lddb.com/viewtopic.php?f=32&t=871 |
Page 1 of 1 |
| Author: | sega3dmm [ 04 Mar 2012, 02:58 ] |
| Post subject: | Bluish blacks? |
I watched Army of Darkness yesterday on my Mitsubishi Megaview CRT television. I had my LD player hooked up thru composite and had my settings calibrated for the player and the 7.5 IRE level, since this was an American laserdisc. Throuought the film, mostly during the dark sequences, the blacks sometimes seemed washed-out and had this bluish tint. I tried to turn up the brightness, but I saw no increase in detail. Could it be a defective disc, a mastering error, or anything else? Or is it just normal? I ask you this because I'm now watching Total Recall on the same setup and the blacks are almost purple-ish and a bit more black. |
|
| Author: | gumbyandpals [ 04 Mar 2012, 03:14 ] |
| Post subject: | Re: Bluish blacks? |
I've had this issue before on CRTs. Try multiple discs and sources to verify. If it happens with many sources, the problem is the TV and you'll have to go into the service menu to correct it. |
|
| Author: | publius [ 04 Mar 2012, 03:14 ] |
| Post subject: | Re: Bluish blacks? |
Any time you have a video version of a film, you are at the mercy both of the film itself & of the film-to-video transfer. "Black" on positive film is an area of high dye density, & if the densities aren't uniform, the darker areas can show some colour. Similarly, the adjustment on the flying-spot scanner or film chain may not be 100% correct for the film density, especially if it varies based on stock, exposure, &c. Not to mention, very rarely is anything truly black in film. A transfer from negative film is a little easier, since blacks are represented by clear or nearly-clear areas. |
|
| Author: | elviscaprice [ 04 Mar 2012, 18:31 ] |
| Post subject: | Re: Bluish blacks? |
Correct me if wrong, but isn't the IRE level more relevant to the LD player than the disc? Therefore if your using a Japanese LD player then your IRE level should be set at 0, not 7.5. This would account for the lighter blacks. Elvis
|
|
| Author: | publius [ 05 Mar 2012, 01:49 ] |
| Post subject: | Re: Bluish blacks? |
elviscaprice wrote: Correct me if wrong, but isn't the IRE level more relevant to the LD player than the disc? Therefore if your using a Japanese LD player then your IRE level should be set at 0, not 7.5. This would account for the lighter blacks. Elvis You're wrong. Video mastered in the US normally has black level at 7.5 IRE above blanking, as per US broadcast standards. Video mastered in Japan normally has black level at blanking level (0 IRE), as per Japanese broadcast standards. The LD player simply reproduces whatever is on the disc, more or less faithfully according as it is more or less well adjusted. |
|
| Author: | elviscaprice [ 05 Mar 2012, 14:36 ] |
| Post subject: | Re: Bluish blacks? |
publius wrote: elviscaprice wrote: Correct me if wrong, but isn't the IRE level more relevant to the LD player than the disc? Therefore if your using a Japanese LD player then your IRE level should be set at 0, not 7.5. This would account for the lighter blacks. Elvis You're wrong. Video mastered in the US normally has black level at 7.5 IRE above blanking, as per US broadcast standards. Video mastered in Japan normally has black level at blanking level (0 IRE), as per Japanese broadcast standards. The LD player simply reproduces whatever is on the disc, more or less faithfully according as it is more or less well adjusted. According to this post, I think your wrong. http://www.hometheaterforum.com/t/11548 ... -ire-0-ire It has more to do with the equipement than the video itself. |
|
| Author: | elahrairrah [ 05 Mar 2012, 16:31 ] |
| Post subject: | Re: Bluish blacks? |
elviscaprice wrote: publius wrote: elviscaprice wrote: Correct me if wrong, but isn't the IRE level more relevant to the LD player than the disc? Therefore if your using a Japanese LD player then your IRE level should be set at 0, not 7.5. This would account for the lighter blacks. Elvis You're wrong. Video mastered in the US normally has black level at 7.5 IRE above blanking, as per US broadcast standards. Video mastered in Japan normally has black level at blanking level (0 IRE), as per Japanese broadcast standards. The LD player simply reproduces whatever is on the disc, more or less faithfully according as it is more or less well adjusted. According to this post, I think your wrong. http://www.hometheaterforum.com/t/11548 ... -ire-0-ire It has more to do with the equipement than the video itself. Not really sure who is right, but don't some LD players have the D-EXT option that will replicate the IRE level of Japanese TVs and LDs? That, to me, would point in the direction that the software is the issue, not the hardware. |
|
| Author: | publius [ 05 Mar 2012, 18:40 ] |
| Post subject: | Re: Bluish blacks? |
elviscaprice wrote: According to this post, I think your wrong. http://www.hometheaterforum.com/t/11548 ... -ire-0-ire It has more to do with the equipement than the video itself. That is a discussion about DVD players. In fact, if you actually read that post, you will see that it says the opposite of what you are saying. A DVD player creates the video waveform based on image data. For this reason, it can scale the black-to-white range into voltages corresponding 100 or 92.5 IRE, depending on the choice of the designer & the user. A LD player does nothing of the kind. It demodulates a video waveform stored on the disc, & outputs whatever is there. The black level is set when the disc is mastered. The only exception to this is in the case of certain Japanese LD players with a function Pioneer called D-EXT, which will process the video to change the black level. This is a switchable function, because it could lead to bad results if improperly used, such as placing the black level of a disc mastered with no setup at -17 IRE, which would lead to clipping. Please don't give advice about analog video, when by your own admission you know nothing about it except that you don't like it. |
|
| Author: | elviscaprice [ 06 Mar 2012, 18:51 ] |
| Post subject: | Re: Bluish blacks? |
publius wrote: Please don't give advice about analog video, when by your own admission you know nothing about it except that you don't like it. The only way to learn is to dive in head first (mistakes and all) and although I appreciate your expertise in these technical aspects, your condescending tone can go you know where. I'm sure you've been told before. Elvis
|
|
| Author: | publius [ 06 Mar 2012, 19:27 ] |
| Post subject: | Re: Bluish blacks? |
elviscaprice wrote: The only way to learn is to dive in head first (mistakes and all) and although I appreciate your expertise in these technical aspects, your condescending tone can go you know where. I'm sure you've been told before. Condescending tone? You've said repeatedly that you don't care about analog video & hope it dies & goes away forever. So I have no reason to believe that you have any interest in learning actual facts about analog video, much less passing them on to anyone else. And, strangely enough, there really are ways to learn about subjects other than spreading misinformation & contradicting people who actually know what they're talking about. I understand Wikipedia welcomes that kind of thing, though, so you could try there. |
|
| Page 1 of 1 | All times are UTC [ DST ] |
| Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group http://www.phpbb.com/ |
|