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picree
Joined: 31 Mar 2006
Posts: 351
Location: Johnson City, TN
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| Posted: Tue Sep 26, 2006 10:59 pm Post subject: Resolution and gray scale |
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I generally run 720p to the BG808. I've used a Sencor to set the gray scale. Recently I noticed that when my HD OTA box switches from an HD program to a SD commercial it gets a green caste to it. Then I was playing w/ my DVD player and sent a 480p signal to the proj and using Avia I noticed the same green caste  . When I switch back to 720p I get a good gray scale. Why????
Same source, same cable, same everything, I just changed the output format on the scaler
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cmjohnson
Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s
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| Posted: Tue Sep 26, 2006 11:18 pm Post subject: |
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I have no experience with Barcos, but with a Marquee that is possible because a Marquee can use the ASR function to recall a setup memory by its scan rate. And the setup memories all use one of four preset color temperature settings.
Perhaps Barcos have something similar to that?
The key is to ensure that you correctly calibrate ALL of your color temperature presets,
and be sure that your setup memories are referring ONLY to the presets you really
want to use.
CJ
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Person99
Joined: 09 Mar 2006
Posts: 4899
Location: Flower Mound, TX
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| Posted: Tue Sep 26, 2006 11:36 pm Post subject: |
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You have calibrated grayscale for HD colorspace (Rec. 701). You probably just used that block as a basis for your 480p block. If so, when you get the SD signal, it is SD colorspace (Rec. 601) which results in a green cast. You need to calibrate the grayscale for the 480p memory block.
Dave
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Wed Sep 27, 2006 1:15 am Post subject: |
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Dave is probaly right for the HD box.
And when you change to the DVD player Blue focus (or defocus..) may be different between memories.
Greyscale needs to be set for each memory/input.
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picree
Joined: 31 Mar 2006
Posts: 351
Location: Johnson City, TN
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| Posted: Wed Sep 27, 2006 1:35 am Post subject: |
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| Person99 wrote: | You have calibrated grayscale for HD colorspace (Rec. 701). You probably just used that block as a basis for your 480p block. If so, when you get the SD signal, it is SD colorspace (Rec. 601) which results in a green cast. You need to calibrate the grayscale for the 480p memory block.
Dave |
Dave-I may be missing what you are saying. An HD box will output 480i on SD commercials and 720p on HD? no....I would see the Barco switching rez's everytime it went to a commercial.
I understand what Mark is saying about memory/inputs/blue focus so I will check into that. Maybe setting this will affect the HD/SD OTA stuff??
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picree
Joined: 31 Mar 2006
Posts: 351
Location: Johnson City, TN
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| Posted: Wed Sep 27, 2006 1:54 am Post subject: |
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Barco memory/inputs/focus are all identical for 480p vs. 720p. The scaler memories are the same as well.
Dave-is it possible that the digital HD OTA channels are switching that colorspace or not using the correct one consistently? Does anyone else see this? The white levels in commercials are green? I mean HD material Sunday night football on NBC looks stunning! But then some of these cop shows (even ones in "HD") look horrid with all the whites shaded green...like the Matrix.
_________________
MAIN THEATER: (JVC RS2000; Yamaha UDP-LX500; Yamaha RX-V2400; Lumagen Radiance Pro, Vertex)
SECOND WII-ATER: (BG808; WII; Oppo 971H; Moome external box; BG-DVI transcoder; tse gamma box; Extron)
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WanMan
Joined: 19 Mar 2006
Posts: 10270
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| Posted: Wed Sep 27, 2006 8:48 am Post subject: |
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picree, I believe that the HD colorspace includes everything found in the SD colorspace, but keep in mind that the SD commercials on that HD channel are still limited by their original composition, which is rec. 601. For instance, if you viewed the same SD commercial on an SD signal input that was calibrated rec. 601, it would look fine.
_________________
Trust no one. Absolutely no one. Advice of the board.
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