Select the image layer in the Canvas Layer Editor. Click the chain link or empty box icon for the mask layer you want to dis-associate/associate.
The Canvas Layer Editor shows the different types of layers on the current canvas. Image layers and Mask layers are displayed separately inside a split window. This allows you to associate one or more mask layers with any image layer, and re-use the same mask layers for different image layers.
To dis-associate a mask from an image layer
The icon becomes an empty box icon .
To associate a mask with an image layer
The icon becomes a chain link icon mask link.
To see the relationships between image and mask layers
The associated Masks and Invisibility Masks’ names are highlighted in lavender. A small icon next to the image layer’s name shows how many masks are associated with it.
The affected Image layers’ names are highlighted in lavender.
To (temporarily) disable a mask while keeping its associations
All associated mask names are highlighted in lavender.
The mask is disabled, that is it no longer affects the image layer, but it remains linked to it.
To hide all masks associated with an image layer
All associated mask names are highlighted in lavender.
The masks become invisible, but are still enabled.
To (temporarily) disable all masks associated with an image layer
All associated mask names are highlighted in lavender.
The masks are disabled, that is they no longer affect the image layer they are linked to.