Go Back  DVD Talk Forum > DVD Discussions > DVD & Home Theater Gear
Reload this Page >

can lowering the contast help refrain the number of compression artifacts?

Community
Search
DVD & Home Theater Gear Discuss DVD and Home Theater Equipment.

can lowering the contast help refrain the number of compression artifacts?

Thread Tools
 
Search this Thread
 
Old 09-06-03 | 08:38 PM
  #1  
Rypro 525's Avatar
Thread Starter
DVD Talk Hero
 
Joined: Apr 2002
Posts: 28,263
Likes: 0
Received 2 Likes on 2 Posts
From: a frikin hellhole
can lowering the contast help refrain the number of compression artifacts?

I always thought if you put the contrast too low, it becomes a bit too soft and sometimes hard to make out stuff. On my big screen (the contrast is about at 75-80%) the artifacts on the se7en dvd are horrendus (everything from the frames of peoples glassess to the eraser oif a pencil, everyhting goes wild, so would lowering the contrast help this.
Old 09-06-03 | 11:43 PM
  #2  
DVD Talk Special Edition
 
Joined: Feb 1999
Posts: 1,075
Likes: 0
Received 0 Likes on 0 Posts
From: Easton, PA
I would think that lowering the brightness would do more to reduce compression artifacts than contrast. In either case you should calibrate your set with a test disc like Avia or Video Essentials to make certain that all settings are set correctly. You don't say what brand of set you have but running your contrast very high on a RPTV will lead to uneven phosphor wear or "burn in". On my set contrast OOB was at 100% but after calibration it's about 35%. Also the Seven SE DVD has a fantastic transfer so if you're seeing artifacts something is definitely set wrong.
Old 09-07-03 | 06:23 AM
  #3  
Rypro 525's Avatar
Thread Starter
DVD Talk Hero
 
Joined: Apr 2002
Posts: 28,263
Likes: 0
Received 2 Likes on 2 Posts
From: a frikin hellhole
tried lowering the contrast on my mitsubishi 60 inch projection tv (got it in 1996), while they don't look as bad, they are still there
Old 09-07-03 | 11:50 AM
  #4  
Josh Z's Avatar
DVD Talk Legend
 
Joined: Dec 2001
Posts: 11,962
Received 350 Likes on 243 Posts
From: Boston
Setting your contrast too high (and 75-80% is WAY too high!) will indeed make compression artifacts more pronounced. You desperately need to adjust your TV with a decent calibration disc ASAP.

You don't say which edition of Se7en you have. The original flipper disc was one of the earliest DVD releases and has pretty poor compression quality. The 2-disc SE is much better.
Old 09-07-03 | 06:26 PM
  #5  
Rypro 525's Avatar
Thread Starter
DVD Talk Hero
 
Joined: Apr 2002
Posts: 28,263
Likes: 0
Received 2 Likes on 2 Posts
From: a frikin hellhole
I have the new 2 disc version. A good example of a "poor" scene imo is the opening scene where we can see Morgan Freeman's character getting out of bed. We then see a closeup/insert shot of his glassess and the rims and everything else that can jump, is jumping)
Also is it the player or the dvd when sometimes in shots where we see a brick building, there are all of these wavy lines accross them, what are those. Also, what are the little jumping lines, that you see ofen on a shot of stairs.
would that new digital calibration kit that comes out soon be good for my player.
Old 09-08-03 | 10:49 AM
  #6  
Josh Z's Avatar
DVD Talk Legend
 
Joined: Dec 2001
Posts: 11,962
Received 350 Likes on 243 Posts
From: Boston
Rypro, some of the artifacts you are describing sound like moire. This is an interlacing artifact. Is your television a progressive scan model?
Old 09-08-03 | 12:09 PM
  #7  
Rypro 525's Avatar
Thread Starter
DVD Talk Hero
 
Joined: Apr 2002
Posts: 28,263
Likes: 0
Received 2 Likes on 2 Posts
From: a frikin hellhole
I'm not sure, I don't think my player is. I noticed that alot of the tv shows that I have seen on dvd (24, sopranos especially) are really bad in moire effects. are there any ways to get rid of those?
Old 09-08-03 | 03:40 PM
  #8  
DVD Talk Legend
 
Joined: Apr 1999
Posts: 14,259
Likes: 0
Received 2 Likes on 2 Posts
From: Docking Bay 94
Originally posted by Rypro 525
On my big screen (the contrast is about at 75-80%)
As Josh says, you need to calibrate this set. That setting is way, way too high.

This will probably be $18-20 well spent:
http://www.dvdtalk.com/reviews/read.php?ID=7502
Old 09-09-03 | 12:32 PM
  #9  
Josh Z's Avatar
DVD Talk Legend
 
Joined: Dec 2001
Posts: 11,962
Received 350 Likes on 243 Posts
From: Boston
Originally posted by Rypro 525
I'm not sure, I don't think my player is.
If your TV is "HDTV-ready" it is progressive scan. If it's not, it probably isn't progressive.

If the TV is progressive, a decent progressive scan player is recommended and can help to clean up some of those problems.

Here is a nice long article explaining all the technical nitty-gritty of how progressive scan works:

http://www.hometheaterhifi.com/volum...e-10-2000.html
Old 09-09-03 | 06:52 PM
  #10  
Rypro 525's Avatar
Thread Starter
DVD Talk Hero
 
Joined: Apr 2002
Posts: 28,263
Likes: 0
Received 2 Likes on 2 Posts
From: a frikin hellhole
I did lower the contrast some what (down to around 20-30% , and still see some, haven't tried se7en yet
Old 09-11-03 | 07:36 PM
  #11  
Rypro 525's Avatar
Thread Starter
DVD Talk Hero
 
Joined: Apr 2002
Posts: 28,263
Likes: 0
Received 2 Likes on 2 Posts
From: a frikin hellhole
think I may have figured out my problem
"depending on your DVD player's downcoversion ability, it may add more artifacts worsening the picture than a non-anamorphic DVD" I guess I have a bad dvd player for that
Old 09-12-03 | 05:17 PM
  #12  
Cool New Member
 
Joined: Jun 2003
Posts: 25
Likes: 0
Received 0 Likes on 0 Posts
From: Indianapolis
Rypro 525 -- the problem may likely be with your DVD player. What player are you using? From my personal experience, I orignally bought a Mitsu dvd player when I bought my Mitsu RPTV -- big mistake. Several discs (notably Twister), looked horrible with compression artifacts, banding, etc. Correct calibration with Avia, in conjunciton with a good pro-scan player (I love my Sony) will make all the difference.
Old 09-12-03 | 08:16 PM
  #13  
Senior Member
 
Joined: Mar 2000
Posts: 572
Likes: 0
Received 1 Like on 1 Post
From: Reidsville, GA
What is your sharpness set at? Having the Sharpness set too high will accentuate artifacts also. Lowering it will make the picture somewhat softer, but will also smooth over some of the artifacts. You have to find a good balance point where the picture isn't too soft but not too sharp either - as others mentioned, a calibration disc is a good way to determine the best settings.
Old 09-13-03 | 05:51 PM
  #14  
Rypro 525's Avatar
Thread Starter
DVD Talk Hero
 
Joined: Apr 2002
Posts: 28,263
Likes: 0
Received 2 Likes on 2 Posts
From: a frikin hellhole
I have the samsung dvd-101 , and the sharpness is currently at 0. I noticed that leaving the color lower, reduces the chance of pixilation on some discs. Would lowering the color brightness help. (there's high, medium, and low on my set)
Old 09-13-03 | 06:26 PM
  #15  
Senior Member
 
Joined: Mar 2000
Posts: 572
Likes: 0
Received 1 Like on 1 Post
From: Reidsville, GA
Originally posted by Rypro 525
I have the samsung dvd-101 , and the sharpness is currently at 0. I noticed that leaving the color lower, reduces the chance of pixilation on some discs. Would lowering the color brightness help. (there's high, medium, and low on my set)
I'm not familiar with the samsung, so I'm just guessing here - but the "color brightness" setting may refer to the color temperature. On my set the settings are warm, medium and cool instead of high, medium and low. Warm/high gives you the picture a more reddish tint, medium is neutral, and Cool/low gives the picture a bluish tint. From what I read when setting up my set, medium or Warm (high) is the best setting to use. Most people don't recommend using the Cool (Low) setting. I use Warm because it gives the picture a richer look and feel. I will say this - using the Cool (low) setting on my set really brings out the artifacts in dvd's/Dtv, etc. - so you may want to try the high or medium setting on your tv instead of the lower setting. But again, I'm just guessing here, so take this advice with a grain of salt.

As for the sharpness, it depends what kind of scale your set uses.
Some sets us a 0 - 100 scale (in which case yours would be as low as it can go), and some sets use 0 as a mid-point - where lowering it will take the setting into the negative numbers and raising it will take it into the positive numbers.

You may want to take a look at the Home Theater Spot - go to the Samsung forum and you should be able to find a lot of information.
Old 09-13-03 | 07:37 PM
  #16  
Rypro 525's Avatar
Thread Starter
DVD Talk Hero
 
Joined: Apr 2002
Posts: 28,263
Likes: 0
Received 2 Likes on 2 Posts
From: a frikin hellhole
on the tv (thats where the color settings are) the system uses bars and I am estimating at what settings they are, and I have like a 96 or 97 model so that might be the reason.
Old 09-24-03 | 03:20 PM
  #17  
covenant's Avatar
DVD Talk Limited Edition
 
Joined: Mar 2001
Posts: 5,137
Received 20 Likes on 16 Posts
I recommend Avia or Video essentials to calibrate your dvd-tv combo
Old 09-24-03 | 06:56 PM
  #18  
Rypro 525's Avatar
Thread Starter
DVD Talk Hero
 
Joined: Apr 2002
Posts: 28,263
Likes: 0
Received 2 Likes on 2 Posts
From: a frikin hellhole
Originally posted by covenant
I recommend Avia or Video essentials to calibrate your dvd-tv combo
dont have one of those, (thankfully) I did however had the dvd black level to high (the default mode due to the hurricane) and the alias dvd (which can be pretty bad with these "compression artifact"), and it looked better that way.
Old 09-25-03 | 08:07 PM
  #19  
Josh Z's Avatar
DVD Talk Legend
 
Joined: Dec 2001
Posts: 11,962
Received 350 Likes on 243 Posts
From: Boston
Originally posted by Rypro 525
I did however had the dvd black level to high (the default mode due to the hurricane) and the alias dvd (which can be pretty bad with these "compression artifact"), and it looked better that way.
The pilot episode in the Alias box set has two notable compression artifacts, but other than that the rest of the episode (and the rest of the other episodes) look pretty swell.

You need to buy a calibration disc right now.
Old 09-27-03 | 10:38 PM
  #20  
Rypro 525's Avatar
Thread Starter
DVD Talk Hero
 
Joined: Apr 2002
Posts: 28,263
Likes: 0
Received 2 Likes on 2 Posts
From: a frikin hellhole
so will (hopefully) those wavy lines looking at blinds (sev7en looks really bad with this,) and a tad bit of lines on a keyboard (24 pilot) be gotten rid of with a calibration disc. the only reason I'm askin is because i don't want to spend 20 bucks on something and if the picture still looks the same, regret the purchase.
Old 09-28-03 | 07:56 AM
  #21  
Josh Z's Avatar
DVD Talk Legend
 
Joined: Dec 2001
Posts: 11,962
Received 350 Likes on 243 Posts
From: Boston
Try this: Set the DVD player for 16:9 mode and watch those scenes stretched out to the wrong ratio on your TV. If the problem is not present when you watch it that way, it is being introduced by the DVD player's anamorphic downconversion. You could try buying a new DVD player, though I don't know of any reviews which cite which player has the best downconversion, so you'll have to do some research. Or you could buy a widescreen TV and your problem will be permanently solved.

No matter what you do, save up $20 and buy a calibration disc. Even if it doesn't help with this problem, you need it anyway. No one should be without one.
Old 10-03-03 | 12:26 PM
  #22  
Rypro 525's Avatar
Thread Starter
DVD Talk Hero
 
Joined: Apr 2002
Posts: 28,263
Likes: 0
Received 2 Likes on 2 Posts
From: a frikin hellhole
alright here's an example where its bad on my system (could that only i have the player plugged into coaxl compontents (the yellow, white and red plugs))
2 fast 2 furious around 41:40 look at the sears tool chest in the background. it was really jumpin around (as well as the front "grills" of cars, this was also a problem in the new scarface dvd, and the little silver part on the side of a car also jumped around as well.
Old 10-03-03 | 03:07 PM
  #23  
DVD Talk Special Edition
 
Joined: Feb 1999
Posts: 1,075
Likes: 0
Received 0 Likes on 0 Posts
From: Easton, PA
From that description it's definitely your DVD player and that fact that you're not using a progressive scan player. Your TV is also not a digital TV that can accept progressive input I don't think based on the age of it. So what you're seeing is interlaced artifacts on diagonal lines. An interlaced signal has these normally but on a anamorphic DVD that is shown on a non anamorphic display it becomes worse since every third or fourth line of resolution is removed. So I'd say that the problem is caused by these two things 1: being the non progressive output from low end plpayer and 2: being a non anamorphic display.
Old 10-03-03 | 06:13 PM
  #24  
Rypro 525's Avatar
Thread Starter
DVD Talk Hero
 
Joined: Apr 2002
Posts: 28,263
Likes: 0
Received 2 Likes on 2 Posts
From: a frikin hellhole
so at least a progressive scan player will get rid of "most of these" but not all of them. and a calibration disc wouldn't help this?
Old 10-03-03 | 06:26 PM
  #25  
Senior Member
 
Joined: Mar 2000
Posts: 572
Likes: 0
Received 1 Like on 1 Post
From: Reidsville, GA
Originally posted by Rypro 525
so at least a progressive scan player will get rid of "most of these" but not all of them. and a calibration disc wouldn't help this?
A calibration disc may not help with the downconversion artifacts, but it is a good investment anyway - since it will help you fine-tune other aspects of the picture.

I think a progressive scan player will only make a difference if your television has a progressive (component) input. I'm pretty sure if you connect a progressive scan player through composite (yellow plug), s-video or coax, you will still get an interlaced picture.

Last edited by Roy28; 10-03-03 at 06:28 PM.


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.