Removing a white background of QTanimation.

[John Ord]

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.

[Julius Ngeru]

Am not familiar with the ‘key out’ technique. How do I do that. I purchased the animation on line. Thanks for your help.

[Julius Ngeru]

Thanks for responding. How do I do that?

[John Felt]

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.

[John Ord]

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.

Hope this helps
https://library.creativecow.net/articles/onneweer_barend/keylight.php

This is for after effects, but like i said i think you may struggle to key out white, unless its a simple black and white animation.

cheers

chris

[Julius Ngeru]

Thanks a bunch. Am gonna give it a shot.

[Julius Ngeru]

Thanks for pointing me in the right direction.

[Kunal Puri]

First tighten up your image by playing with curves/levels to sharpen the colour and object edges. Precomp this clip.

Working with the precomped clip create a luma mask layer by first applying a colour range filter to key out the white. Play around with the settings till you’re happy. Focus on the edges of the object you’re keying out and not so much on the area inside the object where your highlights may get suppressed because of the filter. The next step will take care of this.

Now that you’ve got a decent edge mask, apply the matte choker to the plugin stack. Reduce the values of the first choker to fill in the suppressed white in your object and then increase the values of the second choker to suppress the white in the edges that spill over. This worked for me with an interview shot against a white wall and I got a fabulously crisp key. Hope it works for you.

All hail the cow!