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14 votes

If, brightness → dynamic range... white balance → what?

The phenomenon you describe is called color constancy, and it is enabled partially by the human vision system's chromatic adaptation and partially by something I will describe using the scientific ...
mattdm's user avatar
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12 votes
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What would happen if a camera used entirely different primary colors?

Color photography is indeed based on the tri-color theory. The world saw the first color picture in 1861 made using red, green, and blue filters by James Clark Maxwell. Today’s color photography is ...
Alan Marcus's user avatar
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10 votes

What would happen if a camera used entirely different primary colors?

Is this already being done? Sure. The Hubble Space Telescope senses the near IR, visible, and near UV spectrum. Any images you see from Hubble that contain information outside of the visible ...
scottbb's user avatar
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8 votes
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If I flip my picture horizontally then would it be the accurate depiction of how people see me in real life?

No. The picture straight out of your camera is what you look like to others. You don't need to reverse it. Think about it - when you take a picture of something else with your camera, you don't need ...
user1118321's user avatar
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7 votes
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Which one is the real car and which one is the reflection?

It's hard to tell with this low quality of image (and one which has presumably undergone some degree of post-processing), but at first glance it appears that the image is not inverted; the reflection ...
mattdm's user avatar
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7 votes

Can the human eye be seen as more like a Bayer sensor than a Foveon sensor?

It's more complicated than this because: Moiré appears when there is a slight difference of spatial frequency between the image and the sensor. But the cones and the rods, being organic, are not in a ...
xenoid's user avatar
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6 votes
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If I take a photo of a light outside the visible spectrum, what will it look like after print?

If humans can not see it, they can not see it. But this kind of photography happens all the time using a device that is sensitive to that wavelength. For example Astrophotography or infrared ...
Rafael's user avatar
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6 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 ...
Michael C's user avatar
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6 votes

If, brightness → dynamic range... white balance → what?

The human eye can also adjust to any color temperature. So, it has a broad ______. What is the blank? Our eyes have a wide range of color (chromatic) adaptation.
Michael C's user avatar
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6 votes
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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 ...
Grimaldi's user avatar
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5 votes

If, brightness → dynamic range... white balance → what?

We see using a combination of our eyes and our brain. As to color adaptation, this phenomenon operates on both eyes independently. Because of this, there is a splendid way that you can demonstrate ...
Alan Marcus's user avatar
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5 votes

Technically, why is the out of focus area blurred more when using a bigger aperture?

The other answers incorrectly associate the blur effect with some lens properties. You don't have to assume anything about how the image is formed by the lens or even that a lens exists. The scene ...
szulat's user avatar
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5 votes
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Why do photographs make a place look bigger than it is?

Short answer: Lenses and field of view. Long answer: Your eyes work very much like a camera, with field of view for binocular vision at about 115 degrees. According to this site, the true central ...
KohGeek's user avatar
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5 votes
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What Kelvin-range of "white balance" does the human vision compensate?

This is described by the Kruithof curve, and the answer depends on the brightness as well as color temperature. From Wikipedia: At the brightness of direct sunlight (along the top of the chart), ...
mattdm's user avatar
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5 votes

What would happen if a camera used entirely different primary colors?

Some general use photographic cameras actually record outside the visible spectrum, so there is some experience with that. Leica M8 was notoriously known for recording IR. The extended range had bad ...
MirekE's user avatar
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5 votes
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How high resolution can a picture be before the human eye stops caring?

I love this question. There are several concepts of resolution and several aspects that affect each one. I will be playing with different names, sorry for that, ppi, lpi, pixel density, etc, but you ...
Rafael's user avatar
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4 votes

What would happen if a camera used entirely different primary colors?

The intensities recorded by each specialized pixel can be mapped to the hue spectrum below. The Bayer matrix does not map to any color. The image is interpolated to yield a full-color-per-pixel ...
Brandon Dube's user avatar
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4 votes

How can I correctly adjust skin color in Photoshop when I have a color vision deficiency?

I think I found something interesting. It feels like a revelation to me! There are some articles about using the eyedropper but on CMYK model. I found a very, very simple method that I feel works well ...
Rafael's user avatar
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3 votes

How does the human eye compare to modern cameras and lenses?

Let me throw a question back at you: What is the bitrate and bit depth of a vinyl record? Cameras are devices designed to, as faithfully as possible, reproduce the image that is projected onto their ...
forest's user avatar
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3 votes

What *exactly* is white balance?

What exactly is white balance? 'White' doesn't have a color balance/white balance. Light sources have a color balance. The amplification of light collected by a camera's sensor needed to make ...
Michael C's user avatar
  • 175k
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 ...
Itai's user avatar
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3 votes
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Why does my eye lose white balance and feel exhausted when I use my viewfinder?

We see using a combination of eye and brain. Our visual response is so complex, many aspects are still not fully understood. Light receptors imbedded in the retina are divided into two types. Highly ...
Alan Marcus's user avatar
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2 votes

Does the human eye experience noise as a camera would?

Your description sounds a lot like the condition known as visual snow, which some people liken to snowy interference on an old analog television. The linked Wikipedia page says: The cause is ...
Caleb's user avatar
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2 votes

Does the human eye experience noise as a camera would?

You are referring to Phosphene. This doesn't have anything to do with photographic noise.
dpollitt's user avatar
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2 votes

If I take a photo of a light outside the visible spectrum, what will it look like after print?

Almost all (probably all, but all is a strong term) printers that render photos use a small subset of specific colors of ink. These inks each only look like one particular color, but the printer ...
AJ Henderson's user avatar
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2 votes

If I take a photo of a light outside the visible spectrum, what will it look like after print?

We tend to use the word "color" a bit ambiguously, so let me pose an alternative answer. If you want to print or otherwise produce an image which has the same spectral reflectivity in the infrared (...
Carl Witthoft's user avatar
2 votes

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 ...
Alan Marcus's user avatar
  • 39.2k
2 votes

If I flip my picture horizontally then would it be the accurate depiction of how people see me in real life?

In case you're using the front camera, this depends on the software you use to take your pics - it may or may not flip the pic automatically. The rear cam always shoots you "as-is", without flipping (...
nicael's user avatar
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2 votes

What would happen if a camera used entirely different primary colors?

Note that you can use any 3 primaries in the visible spectrum and you'll generate an accurate image (within the limits of your recording and display devices) so long as the recording device and ...
user1118321's user avatar
  • 2,893
2 votes

What is the T Stop of a Human Eye?

Your eye can be treated exactly like a camera lens, and its maximum f/# really is around f/2.2 or so. The cornea has an index of refraction of around 1.33, so the fresnel reflections are around 2% or ...
Brandon Dube's user avatar
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