Knoll Unmult is a free plugin that can create an alpha channel from any image or video layer that has bright pixels on a black background. It is useful for creating realistic composites of elements such as fire, smoke, or light effects. In this article, we will show you how to install and use Knoll Unmult in After Effects CC 20.
Step 1: Download and Install Knoll Unmult
Knoll Unmult is available for free from the Maxon website[^1^]. You can download the zip file and extract it to your After Effects plugins folder. The default location for Windows is C:\\Program Files\\Adobe\\Adobe After Effects CC 20\\Support Files\\Plug-ins, and for Mac is /Applications/Adobe After Effects CC 20/Plug-ins.
After installing the plugin, you may need to restart After Effects for it to appear in the Effects menu.
Step 2: Apply Knoll Unmult to a Layer
To use Knoll Unmult, you need to have a layer that has bright pixels on a black background, such as a stock footage of fire or smoke. You can drag and drop the layer into your composition, and then go to Effects > Red Giant > Knoll Unmult. This will automatically create an alpha channel for the layer based on the brightness of the pixels.
You can adjust the Threshold parameter to fine-tune the alpha channel. A lower value will make more pixels transparent, while a higher value will make more pixels opaque. You can also use the Invert option to reverse the effect if your layer has dark pixels on a bright background.
Step 3: Composite the Layer with Other Elements
Once you have applied Knoll Unmult to your layer, you can composite it with other elements in your scene. For example, you can place the fire layer above a background layer and change its blending mode to Screen or Add. This will make the fire blend with the background and create a realistic effect.
You can also use masks, track mattes, or keyframes to animate or control the visibility of your layer. For example, you can use a mask to reveal or hide parts of the fire layer, or use a track matte to make it follow another layer's shape or movement.
Knoll Unmult is a simple but powerful plugin that can help you create realistic composites of elements that have bright pixels on a black background. It is easy to install and use in After Effects CC 20, and it can save you time and effort when working with stock footage or other effects. We hope this article was helpful and informative for you.Step 4: Add Color Correction and Grading
After you have composited your layer with Knoll Unmult, you may want to add some color correction and grading to make it match the tone and mood of your scene. You can use the built-in effects in After Effects, such as Curves, Levels, or Hue/Saturation, or you can use third-party plugins, such as Magic Bullet Looks or Colorista.
To apply color correction and grading, you can either apply the effects directly to your layer, or you can create an adjustment layer and apply the effects to it. An adjustment layer will affect all the layers below it in the composition, so you can use it to create a consistent look for your scene.
You can also use masks or blending modes to limit the effects to certain areas or layers. For example, you can use a mask to create a vignette effect around the edges of your scene, or you can use a blending mode to create a color contrast between your layer and the background.
Step 5: Export and Share Your Work
Once you are happy with your work, you can export and share it with others. You can use the Render Queue or the Adobe Media Encoder to export your composition as a video file. You can choose from various formats and presets depending on your needs and preferences.
You can also use the File > Export > Add to Adobe Media Encoder Queue option to send your composition directly to the Adobe Media Encoder. This will allow you to continue working in After Effects while your composition is being rendered in the background.
After you have exported your work, you can share it with others online or offline. You can upload it to platforms such as YouTube, Vimeo, or Behance, or you can burn it to a DVD or Blu-ray disc. You can also use the File > Share option in After Effects to send your work directly to social media platforms such as Facebook, Twitter, or Instagram. 248dff8e21