This information is used to determine how bright or dark an image will be and is further divided into three channels, i.e., Red, Green, and Blue (RGB). On the other hand, a Luma channel is a video track that stores brightness information. This information determines how opaque or transparent a layer will be when superimposed over another layer. However, they differ in how they are used.Īlpha channel is a type of Track Matte that stores transparency information. This might confuse some users, as both Alpha and Luma channels carry the same information. When altering the opacity of a layer, it may look like the brightness settings are changed. Differences Between Alpha Channel and Luma Channel Opposite of the Luma Matte, the Luma Inverted Matte uses dark or low luminance areas of the upper layer to create a mask for the lower layer. Instead of using the Alpha channel, Luma Mattes uses the brightness level or Luma channel of the upper layer to create a mask for the bottom layer. The Alpha Inverted Matte option is quite the opposite of the Alpha Matte, and around the Alpha channel, it uses negative space from the above layer and will therefore use pixels with 0% opacity as it had 100% opacity. Like the mask, it will use any pixel above 0% opacity and can be useful for various purposes, such as creating a vignette or isolating a certain area of the frame. Let's find out the functions of each option one by one: Alpha MatteĪlpha Matte is an important option under the Track Matte menu, as it allows you to create a mask based on the transparency of the layer you are using it on. Luma: This Track Matte type uses the top layer's brightness to mask the bottom layer. But first, you need to understand what Alpha and Luma are:Īlpha: This Track Matte type uses the layer's Alpha channel to determine the layer's opacity. All Four Track Matte Options In After EffectsĪfter Effects provides four types of Track Matte options: Alpha Matte, Alpha Inverted Matte, Luma Matte, and Luma Inverted Matte, each has its own specific use case. We'll discuss these options in detail in the next section. Under Track Matte's drop-down menu, you can find four further options, two with Alpha and two with Luma. Track Matte mode, Preserve Underlying Transparency, and Blending Modes will be available now.Scroll down and click the "Modes" option to enable it.Right-click on the area above your layers and select "Columns.".If you are still unable to find the Track Matte option, press the F1 key or do the following steps in sequence: Track Matte is located by default in the Timeline Window of the After Effects interface, but if it is unavailable there for some reason, toggle the Transfer Control Pane button on the bottom-left of the timeline. Finding The Track Matte Tool In After Effects On the other hand, Track Matte is a stationary mask applied to the composition rather than a layer. A mask is applied directly to a layer having an image or a video and transforms with the layers.A mask is dependent on a specific layer, while the Track Matter is independent of any layer.Here're some key differences between a Mask and a Track Matte: Both are used to hide or reveal a portion of a layer. In Adobe After Effects, there are two types of masking tools: Masks and Track Mattes. Differences Between A Mask And A Track Matte Thus, if you want to use an image to hide your video until you want to unveil it or add a picture in your text, Track Mattes will help you to shape the appearance of a layer above it. For instance, you can make a top layer that provides an Alpha or Luminous effect and a bottom layer consisting of the image that will be revealed or shown. Moreover, Track Mattes uses Alpha or Luma channels as a layer mask to determine what parts of the layer to reveal. Interestingly, it remains independent of all layers in your projects, which means you can get visual effects and animations more efficiently than with the masks tool. You can use Track Mattes to generate shapes, reveal part of a layer, or keying outs. This tool can be used with video and audio layers, which is essential for creating complex composites in After Effects. Essentially, it lets you create a "hole" in a layer so that underlying layers can show through. What Are Track Mattes In After Effects?Ī Track Matte is an element used in video editing to control the opacity of a layer. Differences Between Alpha Channel and Luma Channel.All Four Track Matte Options In After Effects
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