Questions tagged [spectral]
The spectral tag has no summary.
12 questions
3 votes
1 answer
248 views
Wavelength to RGB conversion issue. Average RGB result is yellow tinted instead of white
I'm currently implementing dispersion in my RGB path tracer. How I do things: When I hit a glass object, sample a wavelength uniformly between 360nm and 830nm and assign that wavelength to the ray ...
- 301
1 vote
1 answer
172 views
Is spectral response curve and spectral power distribution the same thing?
I'm reading section 5.2 of pbrt 3rd edition and came across the part where they explain the concept of RGB colors. When we display an RGB color on a display, the spectrum that is actually displayed ...
- 113
4 votes
0 answers
516 views
Hero wavelength multiple importance sampling
I want to add spectral rendering and dispersion to my pathtracer. I found the Hero Wavelength paper but I have trouble implementing this. This is how I understand the process and where I am stuck: ...
- 233
1 vote
1 answer
1k views
How to calculate spatial frequency of an image just in one direction?
FFT spectra is not what is needed; what I need is a histogram showing which frequencies are there in image in horizontal direction, and which one is dominant Such spatial frequency is usually known ...
- 111
2 votes
1 answer
507 views
Computing sRGB color from SPDs
I'm trying to write my own spectral path tracer and a bit stuck with converting computed SPDs to LDR RGB values. What I'm doing right now is convert sampled SPDs (in ...
- 145
4 votes
1 answer
279 views
Does a constant reflection over the light spectrum lead to grayscale value?
I'm currently fighting with the spectrum->RGB color conversions, my algorithm seems to make an error somewhere, e.g. I get values >1 for some spectral responses. Now there is a way to calculate an ...
- 1,638