thistleknot

I'm not sure how to describe it. I'll try MJW's method.

I used to have this answer saved somewhere, but I can't find it. If I'm doing multiple layers. I recall a way to ensure their transparency affects added to an original opacity level. For example. The underlying (bottom most image) transparency is set to 255 and the next one is set to a fraction of the prior level (it's not 50%... I think it's something like the last value / 1.6), so the next would be 160? Something like that. Basically. If I have two images, and one I apply a mild affect to (say a blur) and I want to layer this over the original image (which is set 255). There is a specific fraction of the prior opacity I set the new one to to ensure I can keep adding these affects together smoothly ad infitum (limited only by integer division).