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This tutorial will allow you to develop a deeper understanding about
mattes, and how they can be used to apply texture and transparency to
your layers in After Effects, by putting together a five-second
television bumper in Adobe After Effects.
In this first part of a series of tutorials, you’ll learn how to take
advantage of greyscale images – mattes – in After Effects. Starting with
some basic images (and the AE project file included on this issue’s
CD), we’re going to dirty up some clean computer type to give it a
realistic feel.
You’ll use 3D space for positioning the image, and use the images and
textures supplied to create the five-second effect shown at the end of
the masterclass. Remember, the key is to have fun, and apply what you’re
learning to your own projects.
Each layer in After Effects can have its own matte. This can be done in several ways, but one way is to use a layer’s Track Matte setting. Create a new composition called ‘Scene 1’. Let’s start with the words “Coming Up” typed out with the AE Type Tool, as above.
Currently it has no options, because there is not an image above the layer in the stacking order.
A ‘Luma matte’ disregards the pictures colour information and only looks at the greyscale information. The Track Matte function lets us use the texture of this image as a matte, therefore applying that greyscale information to the transparency of the text.
This is a great way to make ‘perfect’ computer type look more realistic. The other wonderful thing about track mattes is that they’re independent of the layer below.
Need a mask that doesn’t move with the layer? A track matte is a perfect solution. An important note – if the track matte layer does need to move with the layer below, it can simply be parented.
There is no transparency in the image, but, as we’ve learned, a greyscale image is just transparency in the waiting. We can easily apply this JPG to the transparency of another image.
This time, instead of a track matte, an effect called Set Matte will be used. Create a new black solid: Layer>New>Solid. Call it ‘Ink1’ and make it the size of the comp.
In the Use For Matte setting, set it to Luminance. Also, check the Invert Matte checkbox.
One thing to understand with this effect (and any effect in After Effects that references another layer like this) is that it only looks at the source of the layer.
In other words, when the layer ink_matte1.jpg is defined as a matte with Set Matte, none of the transformations, effects, and masks of that layer will be visible to the Set Matte filter, only the source image. However, the solid ‘Ink1’ can be moved wherever we want.
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