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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Sat Mar 14, 2009 12:11 am Post subject: Input Contrast and Brightness Lumagen |
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I am using a Lumagen vision scaler attached to a Barco projector. I notice that you can adjust the brightness and contrast of the input image and this, of course, adjusts the contrast and brightness on the screen even though the contrast and brightness on the projector have remained unchanged so i was wondering if;
Adjusting the brightness and contrast on the input signal is the same as adjusting it on the projector and therefore would increase wear on tubes or not?
If it is the same what is the point of being able to adjust on input anyway?
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sat Mar 14, 2009 3:03 am Post subject: |
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its there for those sources that elevate or have poor outputs for contrast or brightness. this way you dont have to keep changing your Displays contrast or brightness. its a way to be able to use one input on a display with out calibrating a different display input for each source, now you can keep a level playing field
for all sources Via the lumagen.
Athanasios
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Sat Mar 14, 2009 3:18 am Post subject: |
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Yes I see your point.
Even though the brightness and contrast on the projector have not changed the image can be made brighter by adjusting the same on the input. Is that shortening the life of the tubes? in other words does it have the same effect on the tubes as driving the contrast and brightness on the projector higher.
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Sat Mar 14, 2009 1:27 pm Post subject: |
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| km987654 wrote: | | Is that shortening the life of the tubes? in other words does it have the same effect on the tubes as driving the contrast and brightness on the projector higher. |
For contrast it have same effect, it doesn't matter where in the signal chain you elevate overal Vpp.
Brightness doesn't have much to do with tube life, it's adjusting black reference level not Vpp.
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Sun Mar 15, 2009 2:19 am Post subject: |
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Spot on Ile thanks. So when determining contrast level on the projector you really need to consider the input level as well. So a contrast level of 60% may, in real terms, be higher if you have not considered the contrast level of the input source.
So is there any benefit in where you adjust contrast, that is, is it better to adjust on input or on the projector for image quality or does it make no difference?
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