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Computer Graphics Beta

Questions tagged [brightness]

The tag has no usage guidance.

8 questions
info Newest Frequent Votes Active Unanswered
7
votes
1answer
6k views

“Light intensity” of an RGB value

EDIT: I'm not fully clear on terminology here, what I previously understood to be called "brightness" seems poorly defined. I think I am asking about radiant intensity, that is, the measurable ...
6
votes
2answers
205 views

Calculate an equally bright grey to a linear RGB colour

I'm trying to get a grey linear-RGB-triple that is equally bright as another (colorful) RGB-triple. I have to admit, that there is great confusion for me with all the color stuff, even though I read ...
5
votes
1answer
2k views

Confusion between usages of linear RGB and sRGB

Suppose you have generated an image using linear values for RGB channels. E.g. you linearly interpolated it when doing blending, etc.. When you're going to present this on the screen, should the ...
4
votes
3answers
232 views

Surface shading on an triangle

Let's assume that in a triangle we have computed the brightness on the vertices of a triangle and we have found that it is maximum. Can any other point which lies on that triangle have more ...
8
votes
1answer
226 views

Gamma setting in games - Why 3 icons?

Whenever I try to adjust gamma settings in a game, I am shown three different icons and usually asked to make sure the left-most one is barely visible. Example: What are the other two icons for?
1
vote
1answer
587 views

Spectral path tracing - image color/brightness incorrect

I implemented a spectral path tracing using physically base BRDF models such as Oren-Nayar,Specular Reflection and Transmission, Lambertian. All calculation in the path tracer uses standard illuminant ...
6
votes
1answer
734 views

Actual vs Perceived Brightness of RGB Colour

In this video from about 1:15, it is stated that if you have an RGB value of (0.5,0.5,0.5) it is only 22% as bright as (1,1,1) rather than the expected 50% as bright. Does this mean that RGB is ...
7
votes
1answer
159 views

Brightness and contrast VS Gamma, is it possible to identify the gamma “correction amount”?

Trichoplax question aroused my curiosity and the answers in this question also reminded me why I sometimes use different gamma "amounts" to enhance images. Therefore, is it possible to determine the ...