Re: Removing a white background of QTanimation. by Christopher lavelle on Apr 14, 2008 at 4:38:37 pm
Well you can key out the white, but you may lose some of the movie. depending on what technique you use. Apart from that i dont think there is any quick way doing this, need to think about this at video production time.
Re: Removing a white background of QTanimation. by christopher lavelle on Apr 15, 2008 at 7:42:39 am
Hi there, basically to use a key colour, what you are in effect doing is selecting a colour from the entire colour range and replacing it with no colour information, leaving it transparent. So, every occurance of that colour (or range of colours if you like) will be replaced. This can be done with luma values of colour values.
Here is a good tutoial that explains the concept better than i ever could.
Re: Removing a white background of QTanimation. by Dave LaRonde on Apr 14, 2008 at 4:38:53 pm
Photoshop's tools for this sort of thing are ususally more precise. They can afford to be -- the image in a photograph doesn't change 25 or 30 times a second!
But without knowing the exact nature of the images in your animation, I would try AE's Color Key or Luma Key to begin with.
Dave LaRonde
Sr. Promotion Producer
KCRG-TV (ABC) Cedar Rapids, IA
Re: Removing a white background of QTanimation. by John Felt on Apr 14, 2008 at 9:19:12 pm
You could also try different blending modes. If there is not a lot of white in the rest of your image, then I believe it is the "multiply" bleniding mode that doesn't transfer whites and lighter colors to lower levels. It will change the top image a little, but If you screw around with levels a little bit you might get something that looks right.
