Before BCC i’ve used Knoll light factory, and it has obscuration mode “luma”, when intensivity of flare depends of background luma. How i can get the same in BCC? BCC obscuration type RGB actually the same, but it mix background colors to flare color, I dont need it.
I’m trying make alpha channel from luminance (via BCC make alpha key) and then use this channel in BCC obscuration type “Alpha”, but it doesnt work.
Can you advice a workflow? I need obscuration typy of my flare that depends only from background luminance, and dont mix background colors with flare.
Please follow these steps exactly to achieve the result that you’re looking for
(1) duplicate the source clip
(2) apply the BCC Make Alpha Key filter to the duplicated clip and set the filter Output pop-up to Show Matte and adjust the Input Black and Input White to generate a usable matte with the white areas allowing the lens flare to shine and the black areas obscuring the lens flare
(3) place the duplicated clip underneath the original
(4) apply the Lens Flare 3D to the original clip
(5) set the Obscuration Map Layer to the duplicated clip and set the pop-up beside that to Source + Effects + Masks
(6) set the Obscuration Type pop-up to RGB
(7) move the flare through the image and it should not use any RGB data from the source but instead will rely totally on the duplicated layer, which is black and white
I believe if you follow the steps that I outlined, then set the Make Alpha Key filter Output to Composite (which should output transparent pixels) Then in the Lens Flare set the Obscuration Type to Inverse Alpha and you should achieve the desired result. I’ll take your source shot and set it up for you.
I’ve attached an AE project which pretty much reflects the desired image result that you’re aiming for. You may need to make a few tweaks to get an exact match but this should be a decent starting point.
Update: Continuum 11.0.3 was just released (available for download from the Boris FX website) and it contains a new Luma Obscuration mode in Lens Flare 3D designed to more create the result you were looking for. When Luma Obscruation mode is selected it will modify the brightness of the flare based on the luma of the obscuration map, yet without modifying the colors in the original flare.