Substance Designer: Material Blend Transparency Darkness.

oXYnary

My emissive maps are getting darker after going through the Material Blend.  I don't know if its trying to convert to/from linear but yeah....

For shits and giggles I tried putting through the base node and ended up with the same results.  These have been exported from Substance Painter in 16bit pngs.

poopipe

It's likely cos they're alpha blended.  You'll be wanting and additive or max blend for emissive  maps.

Try running them through a blend node separately 

oXYnary

Thats what I did.  Should I report this to Alleg though as per the emission option not working right in material blend.

poopipe

I'm not at a computer to test this out but... 

Try getting rid of the alpha channel.   If a pixel has 50% transparency then its maximum value can only ever be 50% so it'll naturally get darker