I guess Im trying to do the same thing as this guy
Although I'm not 100% sure what I need to adjust in the suggested answer there.
"Maybe it would help to push the depth in the screen-layer to 100% for all four colors with a Curves Layer.
Create the doc in CMYK, grab your "glint layer". Adjust the curves and then maximize the contrast and then set the layer to screen."
Could someone please show me which handles/options I need to adjust there?
Your best bet is to flatten the document, then convert to CMYK.
Blending in CMYK (or LAB) isn't always going to match RGB.
Hi Chris, when I flatten, bring into illustrator and then change it to screen blend, everything is 15 - 20% opacity whiter, so I go back into photoshop and crunch the levels a bit more making it more contrasty, this helps lose the unexpected whiteness but I also then start to lose the detail in the flare themselves.
What I have done is start to painstaking build a flare from scratch picking apart bits of a vector flare created in illustrator using the flare tool.
It's taking some time but atleast I'll be able to use them if I come across this again in future!