Masking

Masking section

Name: mask.enabled
range: yes, no
default: yes

Masking keeps fixed parts of the picture, such as the HUD, from warping.

The examples on this page use a 60 fps copy of the clip, where the errors are larger. Most show one interpolated frame without blending.

Method

Name: mask.method
range: peel, still, image
default: peel

peel	removes the HUD before interpolation and restores it after, also when the HUD is transparent
still	fades pixels that do not change between frames instead of warping them
image	keeps the original frame in the parts that a mask picture marks

With masking off, the chat smears when the camera turns. Peel keeps it sharp. Still leaves faint copies of some letters. Image keeps the original frame in a box over the chat, so the wall in the box does not move with the scene.

off peel still image

Peel limit

Name: mask.peel limit
range: 1 to 20
default: 6

Peel counts a pixel as HUD when it does not follow the motion of the scene. A higher limit marks fewer pixels as HUD.

At 20, parts of the chat do not count as HUD and smear. Values below 6 give the same result in this clip.

6 20

Still limit

Name: mask.limit
range: 0 to 20
default: 4.5

A pixel counts as still when it changes by no more than this value between two frames, on a scale of 0 to 255. Raising it marks more pixels as still.

This example blends. At 20, the moving grass counts as still and gets no motion blur.

4.5 20

Edge

Name: mask.edge
range: 0 to 20
default: 5

Edge and Tolerance belong to the still method. A pixel also counts as still when its detail is stronger than Edge, on a scale of 0 to 255, and stays the same between two frames. Lowering it lets weaker detail count.

At 0, the texture of the moving wall counts as still and shows as grain. Tolerance is 100 in this comparison.

0 5

Tolerance

Name: mask.tolerance
range: 0 to 100%
default: 30%

Sets how much that detail may change between two frames, as a percent of its strength. Raising it marks more pixels as still.

At 100, the texture of the moving wall counts as still and shows as grain. Edge is 0 in this comparison.

30 100

Mask gallery

Name: mask.image
range: a mask name
default: none

A mask is a PNG file in the masks folder next to the app, and black in it keeps the original frame. Click a mask to use it, or hover over one to see it on the preview.

To add a mask, press + to draw one on the clip or import an image, or drop PNG, JPG, WebP or BMP files on the section. Right-click a mask for more actions.

none add tile

Soft edge

Name: mask.soft edge
range: 0 to 100
default: 0

Appears once you choose a mask, and in the editor. Blurs the mask out from its edge, so the original frame fades into the interpolated frame. The value is in pixels at 1080p.

At 0, the wall in the box ends at the top edge of the box. At 100, it fades out above the box.

0 100

Mask editor

To open the editor in the Masking section, choose Draw on the clip or Edit, or double-click a mask. Paint the parts of the preview that keep the original frame. Save writes the mask to the masks folder under Name.

Mask editor keys

Erase: Right dragAlt drag
Paint or erase: XE
Brush, box, ellipse: BRO
Brush size: []
Straight line: Shift click
Square or circle: Shift drag
Invert: Ctrl I
Zoom, move the view: WheelMiddle drag
Cancel: Esc