Rendering with transparent PNG doesn’t render the bloom-effects Eevee

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1

Hi there folks,

I’m trying to create a animation in Blender 2.8 in Eevee. When exporting to transparent PNG’s it doesn’t render the bloom I’ve setup. See the image…

Is there something I can do to change this, thanks!

image_01
image_011920×1080 257 KB

image_02
image_021920×1080 125 KB

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3

Have you tried to render to EXR and see what happens with it?

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4

:warning:

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5

Do you say Output / FileFormat / OpenEXR?
It does not work on eevee. But thanks.

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6

I did not understand “!”

7

It just means it’s not possible at moment.

8

Such a beautiful tool, and it can not be practical; But why?!

9

Because it´s under active development and it has not been released yet :slight_smile:

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10

That’s right. Let’s wait then. Thanks.:slightly_smiling_face:

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11

The PNG image specification does not support these kinds of images with additive glow. When Blender writes a PNG image, it is discarded. What Blender could do better is try to write an image that looks as close as possible, but not exactly the same.

Whenever possible I recommended outputting EXR files, which EEVEE does support. This file format is designed for storing renders without data loss.

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12

With EXR output the background is black, with bloom; I need it transparent.

image
image983×285 65.5 KB

13

You could try compositing like the example I linked here. I split the rendered image in two nodes, blurred one and then mixed them together again. You can play with the blend modes if you want a slightly different effect and increase/decrease the blur with the x and y blur factors (amount is in pixels I believe)

@brecht Isn’t this what Blender should be able to render with bloom? This is additive glow or am I wrong or misreading your comment?

Here is a link to the file.
https://drive.google.com/file/d/1LFRLV7ICzz7T-0yjLyIund85htzcVYbU/view?usp=sharing

BlurBloom.jpg1920×1080 100 KB

Screenshot-2018-11-28-at-12.24.02.jpg1392×809 250 KB

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14

With that setup the glow is not purely additive, it also darkens objects behind.

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15

I see, well close enough for LindaFlowers application I hope. Thanks Brecht.

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16

Thanks. It was close. But I appreciate the effort.

17

Is it possible with glass and shadow?

18

Is what possible? I don’t understand the question :slight_smile:

19

I have the same issue, bloom is not rendered in transparent. Is this a bug that will be solved or is it another limitation of EEVEE ?

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In that case, it’s not limited by png alpha channel, but by eevee that don’t include bloom in render, but blender can render png 8bit alpha channel.

And the issue is the same with EXR.

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A gift for a flower: