Author Topic: Lightmix Kelvin Temperatures doesn´t match  (Read 2488 times)

2020-12-05, 21:10:38

thilima3d

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Hello guys, I was trying to use kelvin temperatures on Lightmix but it seems to set wrong temperatures.
Im using Corona 6.0 and White Balance as default 6500k

Bellow you will see my tests without and with lightmix



1 - Using 4500K directly on Corona Light Properties



2 - Using Pure White on Corona Light Properties and changing to 4500K within LightMix



Left= Corona Lights with 4500K
Right= Corona Lights with White & Lightmix with 4500K




In my opinion, lightmix Color is using Srgb values and not RGB values, or something like that. I created a Corona Color > Color Picked the 4500K little color square on Corona Light Properties to know which SRGB and RGB a 4500k light has, and I got:

SRGB: 255,219,186
RGB: 254,184,127





If I set my lightmix Color to 4500K it gets the SRGB: 255,219,186 Values is doesn´t match the Corona lights 4500k color.
If I set my lightmix Color to RGB: 254,184,127 Values and it matches perfectly with 4500k of Corona Lights.






Any tip on how to get the correct Kelvin RGB on lightmix (besides type the rgb as I did)? Am I doing something wrong? or this is really a Corona Render Bug?
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thank you so much
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« Last Edit: 2020-12-06, 16:24:02 by thilima3d »

2021-01-05, 11:43:54
Reply #1

maru

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Thank you. Reproduced and logged. It might be a bug and it might be related to sRGB, but let's leave this to a proper investigation. I will definitely keep you updated and the only workaround I am aware of right now is your Corona Color trick.

(Report ID=CRMAX-141)
Marcin Miodek | chaos-corona.com
3D Support Team Lead - Corona | contact us