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Mode
Blend
Add
Subtract
Multiply
Chroma
Luma
Lighten
Darken
SoftLight
HardLight
Differece
Exclusion
Description
This is the default mode. When opacity is 1.0 and there is no mask the
overlay image will be copied on top of the original. Ordinary transparent
blending is used otherwise.
This will add the overlay video to the base video, making the video
brighter. To make this as comparable to RGB, overbright luma areas
are influencing chroma and making them more white.
The opposite of Add. This will make the areas darker.
This will also darken the image, but it works different than subtract.
This will only overlay the color information of the overlay clip on to the
base image.
This will only overlay the luminosity information of the overlay clip on
to the base image.
This will copy the light infomation from the overlay clip to the base clip,
only if the overlay is lighter than the base image.
This will copy the light infomation from the overlay clip to the base clip,
only if the overlay is darker than the base image.
This will lighten or darken the base clip, based on the light level of the
overlay clip. If the overlay is darker than luma = 128, the base image
will be darker. If the overlay is lighter than luma = 128, the base image
will be lighter. This is useful for adding shadows to an image. Painting
with pure black or white produces a distinctly darker or lighter area but
does not result in pure black or white.
This will lighten or darken the base clip, based on the light level of the
overlay clip. If the overlay is darker than luma = 128, the base image
will be darker. If the overlay is lighter than luma = 128, the base image
will be lighter. This is useful for adding shadows to an image. Painting
with pure black or white results in pure black or white.
This will display the difference between the clip and the overlay.
Note that like Subtract a difference of zero is displayed as grey, but
with luma=128 instead of 126. If you want the pure difference, use
mode=”Subtract” or add ColorYUV(off y=-128)
This will invert the image based on the luminosity of the overlay image.
Blending with white inverts the base color values; blending with black
produces no change.
Table 2.2: Information about the different modes in the overlay filter,
from [8]
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