Square mask with specific size
Every image I set in a timeline layer need to be masked due to projecting on stage and so need to crop the bottom part of the image.
One way is to pre-made a mask such as the attached one (800x284) but I want better to use Millumin native masking so to be able to tweak the appearance on stage.
I also need to manually adjust the image position relative to the mask, since for every image I need to show different elements relative to the mask.
Using square mask I can manually adjust it, but I just want to have a square not a trapezoid, with a parametric size (i.e. 800x284), attached to projection borders.
Using crop I can define a crop from the bottom of the image, but I can't move the image relatively the crop.
Also every of this solution is attached to the specific image, so that if I want to change the mask I need to do it for every image.
There is any way to achieve what I want? How is possible to set a standard mask for every image?