Chroma keyer
The Chroma Keyer effect is used to make pixels transparent depending on their tint and saturation.
This effect is only available to TVPaint Professional users.
The Chroma Keyer settings are close to the Color Eraser's. You can check the Color Eraser's page to learn about them.
Let's take for example the video sequence above with orange and red flowers. The background of this sequence is a blue-gray shutter (more or less dark blue-gray tints).
If you use the Color Keyer effect by selecting one of the dark shutter colors, it will not remove all the shutter pixels but it will remove some pixels of the flower's stalk too. (see below (1))
If you use the Color Keyer effect by selecting one of the light shutter colors, it will remove all the pixels of the shutter but it will remove the light pixels of the flower's too. (see below (2))
The results above, obtained after the use of the Color Keyer effect, are imperfect. The Chroma Keyer effect will help us to obtain better results.
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The Tint parameter bar will make transparent the blue pixels in a wide range : light blue or dark blue will not change the result. The orange-red pixels of the flowers and the green pixels of the stalk will stay unchanged.
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The Saturation parameter bar permits to make blue pixels more or less transparent depending on their saturation. As a consequence, we will be able to make transparent all the blue-gray pixels.
Here is the result: we finally succeed to keep the pixels of the flowers visible and make the pixels of the shutter transparent.
We can now easily add a landscape on a layer and put it behind the flowers layer.