Detect same color no matter light condition

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I want to detect the same color in dark and light conditions.
I am already able to detect colors, but it depends on light conditions.
How can I fix this?
Thanks.

What I have tried:

R=r*255/(r+g+b)
G=g*255/(r+g+b)
B=b*255/(r+g+b)

Posted 25-Mar-18 6:54am

Member 10850253

Updated 25-Mar-18 7:45am

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Patrice T · Answer 1 · 2018-03-25T07:18:00

Solution 1

Quote:
I want to detect the same color in dark and light conditions.

This have nothing to do with programming, it is off topic.

Quote:
but it depends on light conditions.

That is exactly the problem, there is more than 1 light, and its strength is not the only varying part, its color vary too.
The only reliable way to go is for each picture you want to compare, you need a reference part that you will use to detect the difference of light between picture and then do color correction to compare.

Posted 25-Mar-18 7:18am

Patrice T

Comments

Member 10850253 29-Mar-18 16:20pm

If I use the flash just to recognize the color, would that solve the light issue?

Patrice T 29-Mar-18 16:36pm

It may help but is not necessary the solution.
There is an easy way to know: Take a sheet of paper will parts colored. Then take a picture with and without flash with different kind of lighting.
in dark, artificial light, day light (no sun), on the sun ....
then compare the colors and see if you got matches or not.

Dave Kreskowiak · Answer 2 · 2018-03-25T07:47:00

Solution 2

How? Change the laws of physics.

Not only does the brightness of light source change the color of an object, so does the color and composition of the light illuminating the object you're looking at.

Posted 25-Mar-18 7:47am

Dave Kreskowiak

Comments

Member 10850253 25-Mar-18 16:49pm

What I wanted to say was that I want to detect the true color in every light condition, but from what airline just read, this isn't possible.
Please correct me if I'm wrong.

Dave Kreskowiak 26-Mar-18 8:15am

The only way you can do that is if you knew everything about the light sources involved in illuminating the target object.