"Add Layer Mask" operation in Affinity

[Big_Stan]

When working on a stack In Photoshop it is possible to create a layer mask on one image in the stack and then select “Add Layer Mask” and copy that mask on to the next image in the stack and so forth until all of the images are masked with the same mask.  This technique is valuable when trying to auto-align stars in time lapse photography of the night sky.  For example, in a single 10-second exposure a star will move ~ 2 pixels and if one uses 15 exposures for a median noise reduction stack, the star’s track will create a 30-pixel smear.  If one did not first remove the static foreground from the moving star field image, auto-alignment of the stars would not be possible.

 

Bottom line, how can I perform the “Add Layer Mask” operation in Affinity Photo?

 

When I am through, my goal is to have created an Affinity tutorial to perform “Landscape Astrophotography Noise Reduction with Auto-alignment”

[Lee D]

Hi Big_Stan,

 

Once you've created a mask, right click > Copy, select the next layer in the stack and use Edit > Paste Inside (⌥⌘V) and the mask will be inserted inside that layer.