Questions tagged [gamma]
The gamma tag has no summary.
24 questions
2 votes
1 answer
292 views
Gamma Correction vs Color Picker
I have some confusion regarding gamma correction and the output of my shaders. I'll start with the setup, then explain my current understanding of the matter, and finally the question. Setup I'm ...
- 123
2 votes
4 answers
440 views
Question about function for color
I would like a help to understand the following line of code: return float3(pow(color.r, 2.2), pow(color.g, 2.2), pow(color.b, 2.2)); I've seen some places calling ...
5 votes
1 answer
7k views
Tone Mapping vs Gamma Correction
There is something about these concepts I'm not understanding. I thought the point of gamma correcting images is to make sure that the values in linear space map correctly when displayed on screen: ...
0 votes
1 answer
436 views
Two questions on Gamma correction and Tonemapping
I have few questions regarding tone-mapping and gamma correction. is a tone-mapping operator a function whose output is a value between [0,1] ? If this isn't the case and since gamma encoding requires ...
- 750
3 votes
1 answer
846 views
Offline path tracer produces a darker image than expected
I've been going though Peter Shirley's beginner raytracing books. Upon building the Cornell box and rendering an image, I get a much darker / dimmer image than expected. The color values are ...
user9391
1 vote
0 answers
782 views
Path tracing - Better images without Gamma correction?
So I read about tonemapping and Gamma Correction recently and have implemented it in my path tracer. For the time being I'm using Reinhard tonemapping operator as described in his paper $L_d = L_w *...
- 2,558
4 votes
1 answer
545 views
Gamma correction and halftone
I'm writing a halftone algorithm, which takes standards RGB intensities in the range of $0-255$ and outputs black and white elements with a corresponding size ratio. Should I apply a gamma expansion ...
- 151
20 votes
3 answers
4k views
Should the alpha channel be gamma corrected
We know that in PNG,BMP,etc... the pixel value stored is not in the linear RGB space. But I found no document saying anything about the alpha channel. Is the alpha channel stored in image files in ...
- 661