Blue spots in compositing after color mix I use different pass for specular in BI, make Glare for specular and try to combine it with original picture with Mix node. When I use screen or overlay mix i get final picture with ugly blue spots instead white. What I'm doing wrong and what kind of Mix should i use to combine specular with original image?
You should be using the Add mixing mode when you want to add more white pixels to the image, then plug the specular image in the top (so it adds to the bottom image).

Example: