# Spotlight blend operation

**URL:** <https://forum.logik.tv/t/spotlight-blend-operation/4965>\
**Category:** Flame Questions\
**Tags:** action\
**Created:** [January 31, 2022, 5:05pm UTC](https://forum.logik.tv/t/spotlight-blend-operation/4965 "2022-01-31T17:05:35Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![saul](https://avatars.discourse-cdn.com/v4/letter/s/9e8a1a/32.png) [@saul](https://forum.logik.tv/u/saul)\
**Post date:** [January 31, 2022, 5:05pm UTC](https://forum.logik.tv/t/spotlight-blend-operation/4965/1 "2022-01-31T17:05:35Z")

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anyone knows what is the math operation behind Spotlight Blend in Blend Mode.  
very helpfull blend mode, but no clear what it is doing under the hood.

thanks!

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**Author:** ![GPM](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/gpm/32/4224_2.png) [@GPM](https://forum.logik.tv/u/GPM)\
**Post date:** [January 31, 2022, 6:10pm UTC](https://forum.logik.tv/t/spotlight-blend-operation/4965/2 "2022-01-31T18:10:03Z")

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I don’t know the math particularly, but I use spotlight blend all the time and I find that screen plus spotlight blend equals additive. There’s just a lot more control and nuance with the two blend modes dialed in to taste, as opposed to one add layer. Curious how you are using it?

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**Author:** ![saul](https://avatars.discourse-cdn.com/v4/letter/s/9e8a1a/32.png) [@saul](https://forum.logik.tv/u/saul)\
**Post date:** [January 31, 2022, 8:17pm UTC](https://forum.logik.tv/t/spotlight-blend-operation/4965/3 "2022-01-31T20:17:43Z")

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@GPM, thanks for your input!  
I’m mainly use it for ligh wrapings. quick ex.: bluring front and comping on top in Spotlight Blend mode with a edge matte. nice quick results!

just found it!

- **Spotlight** Like Multiply but with twice the brightness.
- **Spotlight Blend** Same as Spotlight but also adds ambient illumination to B.

rest of operation here…

> **[Blend Modes for Compositing | 3ds Max | Autodesk Knowledge Network](https://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/CloudHelp/cloudhelp/2015/ENU/3DSMax/files/GUID-26F5F348-2DEF-47C8-A5C7-F5D683BA5C00-htm.html)**
>
> These modes set how Composite nodes and the Compositor Output node combine layers. Normal Displays A without any blending. This is the default setting. Average Adds A and B and then divides by 2. Addition Adds each A and B pixel. Subtract Subtracts A...

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<div class="post-metadata">

**Author:** ![GPM](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/gpm/32/4224_2.png) [@GPM](https://forum.logik.tv/u/GPM)\
**Post date:** [January 31, 2022, 8:40pm UTC](https://forum.logik.tv/t/spotlight-blend-operation/4965/4 "2022-01-31T20:40:31Z")

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Sweet. If it’s of any help, here’s my standard light wrap plug and play rig. crok\_lightwrap x3 - blend, screen & spotlight blend.  
[lightwraps.zip](https://forum.logik.tv/uploads/short-url/h9v7YGkgqkHrPqyfc9IJ0uOmEjR.zip) (69.7 KB)

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**Author:** ![saul](https://avatars.discourse-cdn.com/v4/letter/s/9e8a1a/32.png) [@saul](https://forum.logik.tv/u/saul)\
**Post date:** [January 31, 2022, 9:28pm UTC](https://forum.logik.tv/t/spotlight-blend-operation/4965/5 "2022-01-31T21:28:44Z")

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oh yeah! this is great!!  
thank you very much Greg-Paul  
very handly! very appreciated!