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Brightness change from computer to TV/projector
About a year ago, I directed and edited a short film. I finally acquired the rights for the songs…so I will be putting the film in film festivals.
Yet, I have a problem. I used Vegas to make the film…and everything looks fine in the viewer. However, when I render the film (NTSC DV AVI), it becomes slightly darker. I could live with this change. But when I watch the film on different TVs and projectors…the film is bright on some of them and very dark on others.
How do I know what screen to base by lighting from? Is there a way to test and see if it will be too dark on festival projectors? Also, is there a way to render a film without it getting darker?
Thank you! (You can check out “FEVER: The Musical” at http://www.youtube.com/jasonziggy)
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4 Replies
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The difference in screen brightness is due to gamma differences amongst the various viewing devices.
A lot of us use a properly calibrated monitor, in conjunction with the scopes in Vegas, to make judgement calls about any adjustments related to screen brightness, colour, etc.
I’ve done a lot of work that has been viewed on screens ranging from 6 ft. classroom setups to 30 ft. movie theatre setups.
The viewing quality depends on the make, model & age of the projector being used as well as the quality of the screen.
In short, there is no way that you’ll ever know exactly how your video will look from venue to venue.
My advice is to do what I suggested earlier and that’s to make adjustments based on a properly set up monitor.
The JVC TM-H150CGU ($465 at B&H) is my usual recommendation along with this colour bar set-up tutorial.
What happens after that is out of your control.
Sorry 🙁 -
Another common/major difference is studio RGB vs computer RGB (Vegas terms).
Douglas Spotted Eagle
VASST
Aerial Camera -
I am having a terrible time figuring out this color thing. As I understand it (or not) DVavi from a camera will import into Vegas as Studio RGB (or 7.5 to 236). So the clips we put on the time line will be such. What about photos that we import. From scanner, from a CD etc. How do we know what they are coming in as? The generated media I would assume is computer RGB?? Do we need to change each event to the output form , Computer RGB if meant for web or computer viewing and Studio RGB if meant for viewing on TV and I assume a projector before we do color corrections. Then the whole project needs to be converted to either Studio or computer RGB depending on the viewing form? HELP??
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Terry, it’s my understanding that anything other than DV video will be at 0-255 and therefore has to be taken down to the 16-235 range to avoid blown-out video.
I do it all this way no matter what my final output is.
See if the Explanation of levels and the different color spaces used in Sony Vegas article by Glenn Chan explains things any better.
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