bloom affects the intense brighter parts of the image

 

Bloom or glow is a post-processing effect that will blur pixels above a given threshold across the frame to simulate light bleeding on an imperfect lens.

bloom appears at the end of the rendering process and so it may take a moment for it to appear in the render view (complex scenes may take even longer).

Bloom Strength

Multiplier or weight of the glow accumulated on the original image. A value of 0 will return the original image.


Bloom Radius

Spread of the glow across the image, a value of 1 will cause the glow to spread on only a few pixels, a value of 10 will cover a good portion of the image.

bloom_radius is clamped to 1. To disable the effect you should set bloom_strength to 0.

Bloom Tint

Color of the glow for pixels above the threshold.

bloom_tint: white (default), emission_color: blue

Bloom Threshold

Controls the minimum value at which pixels glow.

Default (0.9) applies bloom to hand and bulb. Higher threshold values show bloom on just the brightest specular highlight of the bulb.

The bulb filament cannot bloom because it is behind the glass. Bloom does not take glass (or any kind of light path) into account, only the intensity in the image.


 

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