5
votes
Accepted
Generating and Combining Spectral Colors
Your way of calculating XYZ functions is probably the most efficient way to go about calculating accurate colors from a spectrum. It is standard practice afaik, for examples the books Physically Based ...
- 1,541
3
votes
Accepted
Does CIE XYZ preserve spectral accuracy when used for progressive rendering?
The choice of various tristimulus color spaces or spectral rendering matters when you're doing multiplicative color operations, like multiplying a light source color by a material reflectance. For ...
- 24.7k
2
votes
Does CIE XYZ preserve spectral accuracy when used for progressive rendering?
How accurate it is to estimate rendering equation using wavelengths
This is probably as accurate as it gets if you are using with the full form of Fresnel equation.
then convert result to CIE XYZ
...
- 461
2
votes
Accepted
Computing sRGB color from SPDs
Getting sRGB values outside [0, 1] is expected and normal when using spectral rendering.
The sRGB gamut only covers a triangle in the middle of the CIE chromaticity space:
(diagram from Wikipedia)
...
- 24.7k
1
vote
Does a constant reflection over the light spectrum lead to grayscale value?
I know this is an old question. I did write a spectrum->rgb converter, however all of its relevant parts for this question come from pbr-book source code.
Specifically though, the answer is no. ...
- 461
1
vote
How is Iridescence handled in a Path Tracer?
Iridesence can be seen in several variations: diffraction as seen in CDs and DVDs (see Stam's SIGGRAPH 1999 paper on this), phase shifting and modulation in multi-layered surfaces as you see in ...
- 315
1
vote
Accepted
Is spectral response curve and spectral power distribution the same thing?
The book distinguishes a spectral power distribution from a spectral response curve because they are not the same, they are adjoint.
The thing about adjoints that makes them a little tricky to wrap ...
- 771
1
vote
How to calculate spatial frequency of an image just in one direction?
You can take a 1D Fourier transform of a row of pixels from the image; it will give you the horizontal frequencies present in that row.
You could sample one row out of the image, or else average all ...
- 24.7k
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