人类用冰来“镇”食物的尝试从公元前就开始了,世界各地也早就有了萌芽状态的冰激凌。不过,真正意义上的冰激凌直到十八世纪才出现。在英语里,“冰激凌”是由“冰(ice)”和“奶油(
Work with layer blending modes
Blending modes for layers control how each layer blends with
or interacts with layers beneath it. Blending modes for layers in
After Effects (formerly referred to as layer modes and sometimes
called transfer modes) are identical to blending modes in Adobe
Photoshop.
Most blending modes modify only color values of the source
layer, not the alpha channel. The Alpha Add blending mode affects
the alpha channel of the source layer, and the silhouette and
stencil blending modes affect the alpha channels of layers beneath
them.
You can’t directly animate blending modes by using keyframes.
To change a blending mode at a certain time, split the layer at
that time and apply the new blending mode to the part of the layer
that continues. You can also use the Compound Arithmetic effect,
the results of which are similar to the results of blending modes
but can change over time.