Trying to make the background of an OpenEXR clip transparent

I've made the background of an OpenEXR clip transparent. In the preview it has a checker board pattern but in the edit tab the background is still there and when I have it above another clip it's transparent but the clip underneath is almost completely white (I'm guessing it gets the affect that the alpha channel is supposed to get).

Here are some pictures to better explain:

These are the nodes for the clip

clip in fusion

FdAUlbv.png (16.51 KiB) Viewed 475 times

How the clip looks in fusion:

nodes

eqlHDQH.png (74.77 KiB) Viewed 475 times

How the clip looks in the edit preview with a clip underneath it:

clip in edit

8Wr2yR3.png (72.66 KiB) Viewed 475 times

I would add more pictures but unfortunately I could only attach 3 and I can't post any links.

bump

Looks like you haven’t premultiplied your RGB with your newly produced alpha values. AlphaMultiply node should do the trick.

Can you post screenshots of your settings for your ChannelBooleans and BrightnessContrast nodes?

Looks like you haven’t premultiplied your RGB with your newly produced alpha values. AlphaMultiply node should do the trick.

I added an AlphaMultiply node before the output and now it looks like this:
I'm quite new to fusion so I'm not sure what I'm doing wrong.

unknown.png (300.54 KiB) Viewed 408 times

Looks better, but what I’d check next is values in alpha channel outside 0.0-1.0 range. You must clamp alpha to this range before AlphaMultiply. Currently it seems that premulting changes areas where alpha should be solid. Reason for out of range values probably lies in your brightnesscontrast node.

Looks better, but what I’d check next is values in alpha channel outside 0.0-1.0 range. You must clamp alpha to this range before AlphaMultiply. Currently it seems that premulting changes areas where alpha should be solid. Reason for out of range values probably lies in your brightnesscontrast node.

Thanks a lot, it works now!