Remove Color Matte in Fx Tree ?

[eternal art]

Hi guys ...
is there any node in fx tree similier to remove color matte in after effects and photoshop ?
for who is not familiar with remove color matte .. it's remove a black border around the edges ...

thanks in advanced ....

[GeneCrucean]

Are you sure it's not just a pre-multiply issue?

[eternal art]

thanks for reply ... but it's not a pre-multiply issue ...
this black border appear when i'm tried to use a specific node as an a inverted mask to the another one ...

[eternal art]

I ask tha same quesion in XsiBase and got a solution ... for who is care :
http://www.xsibase.com/forum/index.php?board=12;action=display;threadid=36341;s tart=0#lastPost

[luceric]

The Rank filter erodes the border of the image, it's not so much a solution but rather a hack.

black fringes are premultiplication issues. If you have alpha masks and invert them and re-combined them, you need to unpremultiply everything because the alpha fringes are encoded as well in the RGB of the image. AfterFx avoids the complication by forcing unpremutiplication on everything at the start, and hiding the details later. Exact what is wrong here would require seeing the tree.

[eternal art]

thanks luceric .. i'm in vacation and far from my pc ... when i'm back i will post an image for the tree ..
many thanks ..

[eternal art]

the first image ... is one of the satuation that i get black border problem (i was tried un/multiplay and many other trick ) ... but with no luck

http://img339.imageshack.us/img339/258/39601889ag1.jpg


the second image with "Rank filter" (as you mension luceric it's a hack .. but it do the trick in my satuation) .

http://img363.imageshack.us/img363/1761/91605508ln6.jpg

sorry for the big image resolutions ...

[luceric]

I can't say with certainty where the problem is, however I suspect the problem is in the left branch of the "Over2", in the combination of the In_Font_Main and its ambiant occlusion.

One rule of the tumb is that all image combination like Math Composite break with premultipication.

Let's say you have an RGBA image. The RGB pixels have been multipled by the alpha, so they go toward black at the border of the image.

If you multiply or substract two premultiplied, RGBA images together, the border around the image will be incorrect, it will be darker than it should be. The images need to be un-premultipled before combining them that way.

Only the Over node doesn't require unpremultiplication.

Btw, where did you get all those nices icons in the toolbar below the fxtree and on top of of the left monitor?

[eternal art]

thank you luceric for the info ... (i will give it a try) .
Btw, where did you get all those nices icons in the toolbar below the fxtree and on top of of the left monitor?i made it by myself to speed up my workflow ....
the toolbar below the fx tree is the same icons that exist in fusion .. i do some work in fusion some time , so i want to match the same graphic node .
and about the main shelf .. i made most of the icons in xsi and photoshop .
there are a lot of script and customization in this shelf .. it's great time saver and tested in production everyday .. i plane to make it ( public addon ) when i'm finish the rest of the buttons .

[GeneCrucean]

i plane to make it ( public addon ) when i'm finish the rest of the buttom .

I was going to say that you should just release it because every time you post an image of your UI, someone comments on that thing :)