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Discussion Starter · #1 ·
I'm using a Chroma 5 with a felt head that is held tightly against the TV screen (Pro-111FD plasma). Also, in the CalMAN software I'm using there's an option to choose the type lighting conditions for which the calibration is being done (with a corresponding gamma).


Is it still important to match ambient light conditions to a particular calibration, e.g., only do calibration for dark room conditions at night (or in a room that has well-controlled light levels)? Is there any way for ambient light to 'leak' into the front panel and affect the colorimeter's readings?
 

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Greetings


Lights overhead have a tendency to do that ... but if light is roughly controlled even in the day time ... it really has no real impact on the readings.


We often go into people's homes in the day time where lighting might be an issue ... so we take two readings ... one with the room lighting and one under a dark tarp ... most cases ... negligible change ... so off goes the tarp.


regards
 

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Discussion Starter · #3 ·

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Originally Posted by Michael TLV /forum/post/17032151


Greetings


Lights overhead have a tendency to do that ... but if light is roughly controlled even in the day time ... it really has no real impact on the readings.


We often go into people's homes in the day time where lighting might be an issue ... so we take two readings ... one with the room lighting and one under a dark tarp ... most cases ... negligible change ... so off goes the tarp.


regards

Thanks, Michael. What do you use as a dark tarp? A cloth draped over the TV or something?
 

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a heavy blanket ... fleece blanket ...


regards
 

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There has to be a pretty good amount of light to affect the C5, particularly on an LCD panel. Unless you've got spotlights coming down on the TV, or sun hitting it directly, or a godawful amount of light in the room, you should be alright because it does cover the area it is measuring pretty effectively.


As Michael points out, an easy way to test the effect is to cover the display and compare measurements on black or low % and see what the effect is. Likely you'll find that it may have an impact at 0% or extremely low % where your meter readings aren't very meaningful anyway, but at higher % the readings will remain largely unaffected.


non-puck meters that don't sit right on and cover the screen they're measuring have a more significant problem with ambient light.
 

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Discussion Starter · #6 ·

Quote:
Originally Posted by ChrisWiggles /forum/post/17033354


There has to be a pretty good amount of light to affect the C5, particularly on an LCD panel. Unless you've got spotlights coming down on the TV, or sun hitting it directly, or a godawful amount of light in the room, you should be alright because it does cover the area it is measuring pretty effectively.


As Michael points out, an easy way to test the effect is to cover the display and compare measurements on black or low % and see what the effect is. Likely you'll find that it may have an impact at 0% or extremely low % where your meter readings aren't very meaningful anyway, but at higher % the readings will remain largely unaffected.


non-puck meters that don't sit right on and cover the screen they're measuring have a more significant problem with ambient light.

Great stuff!! It's good to know the C5 isn't affected much by ambient light. I'll have see if I can find something around the house to test it out.
Thanks so much Michael and Chris.
 
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