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This question already has an answer here:

im trying to replicate something similar to below where near the exhaust the flames are extremely bright and towards the end of the flame it fades out. i got the glow to be amped up but i have no idea how i can go about controlling where the glow is coming from.

enter image description here

enter image description here

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marked as duplicate by cegaton, Duarte Farrajota Ramos Jun 25 at 22:29

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Use the threshold value.

Pixels that are brighter than the threshold will get the glow.

Values lower than those set by the threshold will not be affected.

Read: Any way to control light halos in the compositor based on emission level?

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