Mask Prompter

Introduction

Mask Prompter is the 2023 way of creating mattes. It’s interactive and easy to use.

General workflow

You create mattes by specifying so-called prompts for the current frame. Prompts can either be points or rectangle masks around an object.

Parameters

Points

Enable “Active” and specify the coordinates of the point. By keyframing the points position you can follow objects.

Boxes

Add rectangle masks to the layer and assign them to one of the five slots. This will create a matte for the object contained inside the rectangle.

Negative Points

Mark areas in the image you want to exclude from the masks.

Edge Enhancement

Run an additional edge enhancement ai to improve the mask.

Output

“Overlay” draws the matte as white overlay on top of the image (set opacity with “Overlay Strenght”). “Matte” will output a simple black and white matte and “On Transparent” will give you the keyed object on alpha.

Overlay Hints

Draw colored rectangles for each prompt point.

Tips & Tricks

If you use the “On Transparent” output the resulting matte can directly be postprocessed with After Effects internal effects like “Refine Soft Matte”.

Backend & Performance

Hardware Acceleration (on GPU version of the plugin only)

Run calculations on the GPU. This will give massive speedups compared to CPU mode.

Lower Precision

Compute with reduced precision if possible. This can save up to half of the memory and give you some speedups.

Samples (not available for all settings)

The number of ai samples to calculate. This will improve the models accuracy.

Computation Tiles (not available for all settings)

Split the computation into several tiles. This can help if you run out of memory.