10
votes
Why is the screen blend mode named 'screen'?
It's called screen because of the analog process it mimics:
From Photoshop Blend Modes Explained :
As an analogy, imagine the selected layer and each of the underlying layers as being 35mm slides, ...
- 873
6
votes
Accepted
How do I calculate the coordinates for secondary colors on a CIE chromacity diagram?
Performing the operation directly using the chromaticity coordinates (ie: taking the midpoint between the two chromaticity coordinates) will yield incorrect results as the chromaticity diagram is ...
- 831
6
votes
Accepted
Can all colors be described with RGB?
Have a look at this introduction to color perception and reproduction. It also contains a comparison of CIE, RGB and CMYK gamuts at the bottom, where CIE represents what the eye can do and RGB and ...
- 424
5
votes
Can all colors be described with RGB?
The colors used in a Bayer filter are already centered as closely as possible to the three wavelengths of light to which human eyes are most sensitive. How sensitive each color is relative to the ...
- 168k
3
votes
Can an RGB channel be shifted to increase color gamut into the violet range?
Yes but you do not even need to.
The color gamut indicated by the triangle is the coverage of linear combinations of the three RGB primaries. By moving the primaries you can expand or contract the ...
- 101k
3
votes
Accepted
How to correct colour from flash (shooting instant colour photograms)
To neutralize colors, add the complementary color.
Cyan – Red
Magenta – Green
Yellow – Blue
So for a greenish photo, you can try a magenta gel over the flash or color-correction filter over the lens....
- 26.3k
3
votes
Is black a color or a lack of color?
Is black a color or a lack of color?
That all depends on how you define color, and whether you are considering additive (e.g. you can't combine different colors of light to create light that is "...
- 168k
2
votes
What do Hue, Chroma, Saturation, Value, Tones, Tints, Shade, etc. mean?
At the same time that photography was still primarily a B&W activity, others were researching and developing theories of human perception of color and models that could be used to describe the ...
- 168k
2
votes
Is black a color or a lack of color?
Black is a color
Black is the absence of light but that is not the same as absense of color.
Color is a phisical-phisiological-perceptual-psycological-cultural interpretation of light and shadows.
...
- 20.8k
2
votes
Is black a color or a lack of color?
This is similar to the "Actually, tomatoes are fruit, not vegetables" factoid — but even more complicated.
In plain English, black is definitely a color. You will find it very clearly defined that ...
- 140k
2
votes
Is black a color or a lack of color?
Light is energy. This is defined as electromagnetic waves. These energy waves are outputted by the sun, stars as well as other sources like artificial light from light bulbs etc. We also get light ...
- 36.3k
2
votes
Is black a color or a lack of color?
This is really a philosophy and metaphysics and psychology and all sorts of question far outside the realm of photography but to simplify it as best I can:
There are four things required for color ...
- 2,417
2
votes
What distinguishes natural photos from filtered ones (color theory)?
I can't really speak to math and color spaces, but as far as what we expect from images takes in the natural world:
Looking at your example image specifically, I think the "rule" that your ...
- 3,896
1
vote
Can an RGB channel be shifted to increase color gamut into the violet range?
Apparently our color perception is willing to be tricked into perceiving "violet" using only lower-frequency wavelengths. I finally found the following explanation of the phenomenon (...
- 3,503
1
vote
Can an RGB channel be shifted to increase color gamut into the violet range?
Gamut is much different than sensor spectral sensitivity. The title of your question infers gamut so to start there, digital cameras do not have gamuts.
Color gamuts are applied to sensor data when ...
- 1,795
1
vote
Accepted
Does colour mixing work with other sets of three colours?
You have your causality backwards. RGB doesn't work because they're opposing colors on the wheel, the wheel is organized as it is because the eyes work in RGB.
The way we see colors is an additive ...
- 1,393
1
vote
Does colour mixing work with other sets of three colours?
The world saw the first color image by photography in 1861 when James Clark Maxwell demonstrated his three-color additive method to the Royal Society. Gavriel Lippmann got the Nobel Prize for his no-...
- 36.3k
1
vote
Does colour mixing work with other sets of three colours?
At the time of taking the images you would want to use a combination of RGB filters; e.g. R+G rejection filters (or a blue colored absorptive type filter) allowing B to pass.
Then at the time of ...
- 10k
1
vote
Can all colors be described with RGB?
In photography we mix or hold back colors in varying proportions and with varying intensities. We can approximate most spectrum colors. By “spectrum” we are talking about those colors that are ...
- 36.3k
1
vote
Is black a color or a lack of color?
Since in photography black is never the absolute black, I would say that for purposes of us photographers and color management enthusiasts, the black is a color.
If you think black is not a color, ...
- 5,115
1
vote
Is black a color or a lack of color?
Visible light is part of the electromagnetic spectrum, our eyes can perceive only a small fraction of this spectrum, from black to white... the lack of light or poor light is perceived as black.
Our ...
- 111
1
vote
What is the difference or relation between a Color Model and a Color Space?
Color model
A color model uses numbers to represent color.
For example: Blue is represented as: rgb(0, 0, 255).
Color space
Next, ask yourself: how blue will this blue color be on your monitor?
It all ...
- 489
1
vote
Why are there no dark yellows, or bright violets?
According to Steven L. Buck, Ph.D, Professor of Psychology, Adjunct Professor of Radiology, who has publications in visual perception at least since 1979, "yellow and brown are one-directional hues ...
- 11
Only top scored, non community-wiki answers of a minimum length are eligible