Just a little issue that has been triggering me for a while, regarding mask rendering : would anyone know the reason why, once rendered, masking shapes set in "multiply" mode tend to show those small, undesirable outlines around the layers they're masking ?
And how to get rid of those outlines ?
![Image](http://peep.s.free.fr/lostmarble/040717stroke01.png)
Such tiny, darker contours as the one around the arm above indeed are particularly noticeable in the case of group-masked folders (i.e. folders comprised of a "multiplied" mask + a "normal" vector layer below, added to that mask) set above one another -- regardless of the fact that each folder is in "normal" mode (the inner mask only is multiplied) and that, of course, neither the masking or masked shape are stroked.
Here is a little screenshot of the kind of folder I'm talking about, in case that wasn't clear :
![Image](http://peep.s.free.fr/lostmarble/040717stroke02.png)
One more crucial detail : those outlines also actually seem to occur upon rendering whenever the mask itself exceeds the surface of the masked shape below. Here is what the arm looks like without masking for instance :
![Image](http://peep.s.free.fr/lostmarble/040717stroke03.png)
Shouldn't however mask shapes be strictly constrained to the shapes they're masking ? Why do those contours show up in case of superposed group masks ?
"Expanding the mask by a pixel" and/or "excluding strokes" of the masked layer below does not make those outlines disappear -- nor does exporting sequences with "antialias edges" and/or "extra-smoothed images" left unchecked.
Hence my request : would anyone know a way to get rid of those outlines please ? What basic detail am I neglecting ?
And, subsidiarily : would it be realistic to expect a future option that prevents a folder from being affected by any other layers'/folders' blending mode ?
![Shocked :shock:](./images/smilies/icon_eek.gif)
Cheers!