while it’s not perfect this workaround works well. The only downside is that the less tone curve amount you set, the less tonemapping you will get, resulting in an overall washed picture. But 0.8 is a good compromise.
Another problem is that emmisive gradients will look strange unfortunately. 
I hope some day there will be an easy solution to this problem, it’s bugging me far too long. 
Any solutions found?
Edit: Set tone curve amount to 0, fixed :D
Now to find out how to stop discourse from automatically using emojis without the invisible letter.
I am surprised in over 4 years there hasn’t been a solution to this, I am assuming it must be quite complex. The ideal solution would be if they introduced a new option in materials, instead of connecting to Emissive we could connect to a simple Glow or Stylized Glow or whatever title fits best.
In their docs, the legacy tonemapper effect is just so beautiful and exactly what I need, but at the same time I wouldn’t want to modify the global settings when I only need it on specific things, that’s why having a separate option just for this in materials would be ideal, or something similar. Really hope they consider doing something like this soon, such a cool effect. Best of luck to everyone.
Some time ago I tried to replace the tonemapper with a different one (sadly I don’t remember which one it acutally was 
)
But with this approach you can even decide if you want saturated or washed out emissive colors by changing the saturation value in the material.
Unfortunately you can’t use the tone mapping settings that you could normally use. So you have to adjust the image inside the post process material and build your own system.
If you want to test for yourself this is the material:
CustomEmissivePostProcess.zip (82.4 KB)
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I tried to do this for my best friend who couldn’t live with these colors. Looked that strongly changes colors. Bloom has changed, but does a similar effect and I did not change it. But the tonemapper makes everything white. I rewrote it as in 4.14. Something worked, but it’s not quite the same effect.
4.27:
4.27 with old tonemapper from 4.14:
4.14:
When you enter the command r.TonemapperFilm 0, the old settings are opened in the post process
4.27 now:
4.14:
Can someone suggest what else can be done. Maybe we’ll make everything perfect)
ShadersPrivate27from14.7z (16.4 KB)
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Aware that this is a really old thread but it’s still an issue. I want to create a material that’s akin to uranium glass, a thing that in real life photographs glows bright green, but I’m not able to mimic it in unreal.
I would also like to be able to have a glowing material with a lot of bloom, without having the colors turn to white. It’s been how many years now and it’s still not something Epic cares about?
everything I did could not be done, my friend was able to reach out to the developers and he was answered with this:
“First of all reorder tonemapper to legacy shader by r.tonemapperFilm 0, we have added old defaults so now it is quite easier to get same stylized colors as <15 versions.
Than you can look at “crush highlights” curve that now negates white PBR shift to legacy curve settings, so simply pull it to 0.
After that yuu can apply same contrast and saturation, but notice that ACES applies boosted threshold so your bloom goes overbright, to handle that you can cut it with “Gain” global to about 0.5.
It will not reproduce colors completely, but closest we have got.”