Luxus export to image output alpha channel doesn't work

iSeeThis

I've tried as it's said in manual. Select File > Export to image > Output Alpha Channel. Go grab png file from temp folder with no luck. No alpha layer as wish. Do I go to the wrong place or missing something else? Thank you!

Jaderail

Have you loaded it into a editor to check? A png will show the BG when viewed but will have a Alpha channel if the BG is just color most of the time. Try to layer it over another image and see.

iSeeThis

Thanks for your reply, Jadrail. But I really must miss something cuz in Photoshop it still has background.

mjc1016

dungtrin said:

Thanks for your reply, Jadrail. But I really must miss something cuz in Photoshop it still has background.

Umm...what is your lighting setup?

If you are using an actual background (and a geometric 'world ball' counts) then you can't get a 'background' free png unless your camera 'looks' past the geometry. And then it will only remove the background beyond the geometry.

It should work with a 'sun/sky' setup or a HDR map with no geometry...

And did you enable 'premultiply alpha' in the render settings?

iSeeThis

Sir, I used these light set. I did put any background. Just an object alone. But there is always the blue screen (in the aspect frame).

mjc1016

Then you need to make sure to set Premultiply Alpha to On...

First image...PMA OFF
Second...PMA ON