# Questions tagged [color-theory]

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### Why is the screen blend mode named 'screen'?

I am studying blend modes and I am comfortable with pixels, channels and math equations. I understand that the screen blend mode is calculated as 1 - (1 - c1) * (1 - c2), where c1 and c2 are the ...
• 161
50 views

### How to correct colour from flash (shooting instant colour photograms)

Not sure if this is quite the right place to post this, as it might also link to colour theory, but I hope someone can help. I have been shooting colour instant photograms using a new back from ...
• 179
1 vote
229 views

### Does colour mixing work with other sets of three colours?

Fellow photographers and I were discussing how to create a positive colour image by overlaying three film BW negatives/positives that were shot using the trichrome process, using three colour filters ...
• 2,623
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### What distinguishes natural photos from filtered ones (color theory)?

I have implemented a filter which makes use of RGB color space plus some transformation functions. This filter can be seen here in action. The natural image is obvious to me. // Natural Image // ...
341 views

### Can an RGB channel be shifted to increase color gamut into the violet range?

TL;DR: Can additive RGB color gamuts produce the perception of light that has a shorter wavelength than the Blue component? If not, does shortening the wavelength of the shortest component of a 3-...
• 3,503
3k views

### Can all colors be described with RGB?

If one could pick ideal sensitivities for the RGB filters of a camera sensor, would it be possible to capture any color as humans see it?
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3k views

### Is black a color or a lack of color?

Is black a color or a lack of color? What are the characteristics that defines a color?
• 153
2k views

### How do I calculate the coordinates for secondary colors on a CIE chromacity diagram?

Imagine a typical device gamut on CIE xy diagram: x and y coordinates for primary colors (red, green and blue) is defined and known, how to calculate secondary colors (cyan, magenta and yellow)?
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10k views

### What is the difference or relation between a Color Model and a Color Space?

What is the exact relation or difference between a color model and a color space? I find these two terms to be used interchangeably in some literature. Are they simply the same? Thanks!
378 views

### Do colors in photographs depend on ambient temperature?

My friend, previously a photographer, said that if you are taking photos in cold weather the photo is more blue (as if a slight blue filter has been applied). Inversely, taking photos when it is warm —...
829 views

### What does 'freedom of color from white or gray' mean?

The dictionary entry for the word chroma says, "the purity of a color, or its freedom from white or gray." What does that statement mean? What is color made of? What causes color? I was reading this ...
3k views

### How to figure out whether the colours in a photo are warm or cool, and how does that matter?

On 1x some people have said that this picture has warm colours. I wish to understand what qualifies to be a warm colour, cool colour, and how does that matter? Warm means bright? and Cool means dull?...
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15k views

### What do Hue, Chroma, Saturation, Value, Tones, Tints, Shade, etc. mean?

I've read several online tutorials about color theory but I'm still confused about how to "visually" catch color concepts and use them efficiently. The only thing I seem to understand is "hue" which ...
• 291
10k views

### Why are there no dark yellows, or bright violets?

In his book The Photographer's Eye, photographer and author Michael Freeman says: Another consideration is relative brightness. Different hues are perceived as having different light values, with ...
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