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Hi!
Normally I donĀ“t use them this way but today I did, got confused and need answers. :)
I have attached a simple comp in this thread explaining my problem.
Basically I have added 2 shape layers, one slightly on top of the other.
I precomposed the top one and created a mask so the bottom one can be seen through the hole.
If I select add for the mask everything works as expected when I change the opacity of the mask but when I set the mask to subtract it is doing the opposite to what I want when adjusting opacity for the mask.
I am thinking that the opacity affects what is in the mask but it is the other way around.
If I want to keep the big red square and adjust the opacity of what shows through the mask, how the *%&/ do I do that? (attached comp made in ae 2015)

Best regards

I can't open the file, but your description tells me that AE is working properly. I suggest that rather than working on a project you just play around with masks and observe how they work.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA

 Re: Question about masks, noob alert.on Nov 22, 2015 at 5:30:11 pmLast Edited By Ricard Rinaldo on Nov 22, 2015 at 5:32:00 pm

I will post a video instead that explains what I am asking.
As already said I created 2 solids and put a mask on the top one.
How can I change the opacity of the inside of the mask with the blue box intact?

 Re: Question about masks, noob alert.on Nov 23, 2015 at 8:56:24 amLast Edited By Kalle Kannisto on Nov 23, 2015 at 8:59:01 am

As you probably figured out, opacity affects the entire layer, not the masked area.

Make a copy of the blue solid, put the mask on one of them to create the hole. Change the opacity of the other copy (the one that doesn't have a mask).

Thanks but what is the point of having the opacity option on the mask if it does the same thing as the opacity for the whole layer?

You have to mess around with Mask Modes -- Add, Subtract, Intersect, Difference, etc. It takes some futzing around to get where you want to be, but that's part of the learning process.

Dave LaRonde
Promotion Producer
KGAN (CBS) & KFXA (Fox) Cedar Rapids, IA

If you have multiple masks, set to different modes, the opacity will behave differently.

- The Great Szalam
(The 'Great' stands for 'Not So Great, in fact, Extremely Humble')

No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.

 Re: Question about masks, noob alert.on Nov 24, 2015 at 7:31:54 amLast Edited By Kalle Kannisto on Nov 24, 2015 at 7:36:49 am

Right, there's an opacity setting for individual masks as well...

To do this with one solid you'd use two copies of the same mask, the first one set to subtract 100% opacity creating the hole, the other one set to add, changing opacity, filling it back in. Also, you could now fade the outside without affecting the inside by changing the opacity of the first mask.