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Questions tagged [human-vision-system]

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38 votes
8 answers
31k views

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

I'm wondering, technically, why and how does the out of focus areas blur more when using a bigger aperture. I think it'd help a lot if I presented a problem that's been driving me nuts for a long time:...
Frantisek's user avatar
  • 2,683
37 votes
8 answers
11k 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 ...
mattdm's user avatar
  • 143k
35 votes
6 answers
4k views

How can knowledge of human perception of color be used in photography?

How does the human vision system perceive color, and how can/should this be taken into account when taking and post-processing photographs (both in color and in black and white)? The bit above is the ...
mattdm's user avatar
  • 143k
34 votes
9 answers
33k views

How to capture the scene exactly as my eyes can see?

What settings of my DSLR camera will emulate the scene exactly as I can see through my naked eyes? I think it's not possible to get the contrast and colors exactly as my eyes can see, and it may vary ...
sat's user avatar
  • 1,727
33 votes
5 answers
50k views

How does the dynamic range of the human eye compare to that of digital cameras?

According to DxO tests, cameras have 10 to 12 stops of dynamic range. Is that correct? Noise can completely screw some lowers values (easily resulting in loss of some stops). Also Norman Koren says ...
Paolo's user avatar
  • 2,781
30 votes
10 answers
34k views

How many "MegaPixels" can the human eye see?

There is obviously a limit to what the human body can process, such as frames per second. My question is how many MegaPixels would it take before the human eye can no longer differentiate it from ...
Spechal's user avatar
  • 409
29 votes
9 answers
9k views

Why don't cameras capture dynamic range as our eyes do?

When sitting in a room with no lights on, and I look out the window, I can easily see the interior of the room even if I focus on a tree outside. Why can a camera not capture a similar image to what ...
LifeH2O's user avatar
  • 411
27 votes
7 answers
3k views

Is it possible to be color-blind and still be a good photographer?

Is it possible to be colour-blind (or color-blind, in the US) and still be a good photographer? Are there any steps one can take to mitigate the effects of colour-blindness? Can you point me to any ...
AJ Finch's user avatar
  • 11.8k
27 votes
9 answers
159k views

What lens focal length most closely resembles the perspective of the human eye?

For example, if I have a lens that is 16mm-50mm, which focal length would be the closest to the human eye's view? (I don't have a camera yet, so I'm just curious.) Would 50mm be more zoomed in than "...
trusktr's user avatar
  • 485
26 votes
5 answers
2k views

How to create an eye-path?

Reading about photography, I have now and then stumbled on recommendations to "create a path for viewer's eye", or to "lead it through the picture" without any specific guidelines how to achieve that. ...
Imre's user avatar
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24 votes
4 answers
9k views

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

A goal in most photography is to present a scene which resembles what a person who had been there at that moment would have seen. Even when intentionally working outside of that, human vision is the ...
mattdm's user avatar
  • 143k
21 votes
4 answers
6k views

Do the infrared photographs really contain infrared colors?

In school, we all learned that from white light we can only perceive the visible spectrum but we can't see UV or the IR portions. If this is the case, then how come we can do infrared photography?. ...
Amrit's user avatar
  • 531
20 votes
13 answers
8k views

Do photographers see ambiguity in the color of the blue/black (gold/white) dress?

Okay, so, this has taken the Internet by storm today... You've probably seen it and lots of commentary. Apparently, many people see this as gold and white; to me, it's unambiguously blue. There are a ...
mattdm's user avatar
  • 143k
20 votes
4 answers
49k views

How many colors and shades can the human eye distinguish in a single scene?

How many distinct colors, shades, hues, and tints can the average person distinguish in a single scene? In other words, what's the theoretical bit-depth required to be sure of recording a photograph ...
mattdm's user avatar
  • 143k
20 votes
5 answers
8k views

Bokeh of the human eye - How does it look like & vary across apertures and individuals?

Precisely what does the bokeh of a human eye look like? How does it vary over different apertures and different individuals? As a near-sighted person, it is fairly easy for me to get some idea of ...
Jukka Suomela's user avatar
16 votes
2 answers
8k views

Why does a 50mm lens appear to give a human perspective, rather than a normal lens?

I grew accustomed to the notion that what one sees through a normal lens equates (or is close to) what can be seen with the naked eye (although that is not the "pure" definition of a normal lens, ...
Berzemus's user avatar
  • 1,047
13 votes
4 answers
648 views

What is it called when an object appears to be the same size with the eye and through the camera viewfinder?

I have a Canon 18-135 lens. I am looking into the camera viewfinder with my right eye and not through the viewfinder with my left. I start from 18mm and keep zooming in till I see a particular object ...
Lazer's user avatar
  • 4,049
13 votes
3 answers
2k views

Why do we actually need to adjust white balance?

The answer seems obvious: without white balance, we would have bad color reproduction, because different lighting would produce lots of different color tints. Our eyes adjust for the color tints so we ...
ithisa's user avatar
  • 233
12 votes
8 answers
3k views

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

So, as many people know, humans have three cones cells, enabling us to see three distinct "primary" colors, which may combine to form the entire spectrum that we are capable of seeing. Meanwhile, many ...
Nicholas Patella's user avatar
12 votes
4 answers
13k views

Does the human eye experience noise as a camera would?

I've noticed when I am in very low light (light that isn't in the same room I'm sitting in), when my eyes adapt to the dark that I see colored particles. Do these colored particles resemble noise in ...
K'''s user avatar
  • 6,497
12 votes
5 answers
3k views

What *exactly* is white balance?

When setting a white balance configuration, we adjust the temperature and green-magenta shift to a wavelength-intensity distribution of light that correlates most closely with the actual distribution ...
Myridium's user avatar
  • 567
11 votes
4 answers
2k views

How do quirks of the human vision system affect photography?

When looking out at the world through our eyes, it's easy to take for granted that our perceptions are an absolute rendering of How Things Are. But in fact, it's not quite as simple as that. Most of ...
mattdm's user avatar
  • 143k
10 votes
2 answers
279 views

Does inattentional blindness prevent us from perceiving fresh photo opportunities?

See this article for a fascinating discussion of inattentional blindness: Inattentional Blindness and Conspicuity It says in essence that our mind discards the majority of things we perceive before ...
labnut's user avatar
  • 8,307
9 votes
3 answers
7k views

Why milky way galaxy cannot be seen by human eye while by camera?

I was wondering by seeing the photos of Milky way galaxy, that how exciting it would be if we could see all those colors and stars like in those photographs (eg. below). source: http://www.flickr.com/...
vivek_jonam's user avatar
  • 3,506
9 votes
3 answers
3k views

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

I have a color weakness. Is there any tool or tools that I can use by using a formula or setting to correct skin color in Photoshop?
user37196's user avatar
8 votes
3 answers
1k views

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

Different things have different brightness levels. And with a normal camera, when we set more exposure to show details in the shadows, the already existing-details blow out. And vice versa — when we ...
user152435's user avatar
  • 1,515
8 votes
3 answers
2k views

How can my eye focus on the viewfinder image?

I noticed that when looking at small items in close distance, minimum focusing distance for eye seems to be about 15cm (6") - closer than that, vision promptly gets blurrier instead of seeing more ...
Imre's user avatar
  • 32k
8 votes
3 answers
4k views

What Kelvin-range of "white balance" does the human vision compensate?

Empirically judged, I would assume that the human vision can't compensate the color of 1850K (candle light) equally efficient as the color of 3000K (incandescent lamp). So, is there a range in which ...
ManualPhoto_graphy's user avatar
7 votes
3 answers
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?
kslstn's user avatar
  • 195
7 votes
2 answers
596 views

What is the T Stop of a Human Eye?

I was reading that the maximum F number of a human eye, if treated the same way as a camera lens, would have an F number of 2.1, but basically since the eye cannot be treated the same way as a camera ...
Ryan's user avatar
  • 1,135
6 votes
2 answers
2k views

How to calculate the viewing distance giving natural perspective?

When I move my eye closer to a photograph, it will fill a larger part of my view. When I move further, the area filled by the image will become smaller. Apparently, there must be some point where the ...
Imre's user avatar
  • 32k
6 votes
2 answers
612 views

How high resolution can a picture be before the human eye stops caring?

I found an article discussing a collective that sells ludicrously high resolution panoramas, at least one of which is comprised of over 1000 images with a resolution of 7 gigapixels. Other than ...
ian's user avatar
  • 347
5 votes
4 answers
8k views

How does the eye perform the equivalent of white balance? [duplicate]

Possible Duplicate: How can knowledge of human perception of color be used in photography? How does the eye perform the equivalent of white balance? Why is the camera not able to replicate it?
Jonathan Winters's user avatar
5 votes
4 answers
2k views

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

As i was reading this article, there was a section that drove my attention to it: The spectrum of colors visible to insects is a little higher in frequency than what we humans can see. The lowest ...
Johansson's user avatar
  • 153
5 votes
2 answers
3k views

How does fading light affect color vision?

It's well known that the cones in retina are unable to distinguish colors in dark, leaving us only the monochrome softer vision provided by rods. And personal experience tells this "switch" to ...
Imre's user avatar
  • 32k
4 votes
3 answers
453 views

How to recognize different lighting color temperatures?

I'm getting my first "real" flash soon, and I've been studying a bit about lighting techniques. However, the flash comes with little colored plastic covers to match the color of the environment's ...
Norman Lee's user avatar
4 votes
1 answer
165 views

How can I make my night photographs portray the sensation of vision trailing off into the darkness?

I am a newbie amateur photographer. I enjoy walking at night in a wood and take pictures. It is not hard with a modern digital camera (I have a Nikon d3100) to show whatever is needed by taking ...
Three Diag's user avatar
4 votes
2 answers
237 views

White balance setting to match the way we perceive things

A white piece of paper on my table does not look as white in the evening when the light bulb is illuminating it compared to daytime when the Sun is illuminating it. The difference is much smaller than ...
Count Iblis's user avatar
  • 3,616
3 votes
3 answers
7k views

What color of light is best for retaining night vision while night shooting?

It takes about 30 minutes for eyes to become completely adjusted to night vision. If a flashlight is needed to illuminate controls while making camera adjustments, what is the best way to protect night ...
wow's user avatar
  • 89
3 votes
3 answers
2k views

What is the "right" displayed color?

Taking in consideration the web environment only, not screen-to-print jobs, let's suppose that we have a font color e.g. #f1ecd6 Hex, displayed by a LCD, properly—by a hardware device—calibrated, ...
user124853's user avatar
3 votes
1 answer
776 views

What is the photopic luminous efficiency function?

What is the photopic luminous efficiency function? Is it actually a the, or are there multiple such functions? Is it an absolute fact of nature or simply an agreed-on standard? If the later, who says?...
mattdm's user avatar
  • 143k
3 votes
4 answers
192 views

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 // ...
entropyfever's user avatar
2 votes
6 answers
3k views

Does the human eye see moiré?

I was just looking at a highrise building whose windows had a horizontal grill in front of them. There were several clothes drying in these windows and the sun was casting shadows on the cloth. The ...
Chinmay Kanchi's user avatar
2 votes
3 answers
449 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-...
feetwet's user avatar
  • 3,603
2 votes
1 answer
2k views

Why do photographs make a place look bigger than it is?

Observation: I recently went to visit a cricket stadium that I have seen quite often in television. Though the stadium looked huge in television, visiting the stadium made me realize that it was not ...
n7rider's user avatar
  • 123
2 votes
1 answer
202 views

Why does my eye lose white balance and feel exhausted when I use my viewfinder? [duplicate]

My D80 has a greenish tint effect (shutter count at approx 46000) in it's viewfinder which goes away if i use it long enough constantly looking through the viewfinder. The weird thing is my other eye ...
Delta Oscar Uniform's user avatar
2 votes
3 answers
195 views

How to understand this statement about gamma correction of 1/1.25?

I don't understand this explanation, "the visual system of the viewer imposes a power function with an exponent of about 1⁄1.25" from in Charles Poynton's paper, The Rehabilitation of Gamma ...
tong cao's user avatar
1 vote
4 answers
2k views

Why doesn't my camera capture a dark picture when it looks dark to the human eye?

I tried searching for this, but found nothing on this topic: is there a way to set the camera to get images in around the brightness a human eye sees? For example, in bright daylight, I would set it ...
SinisterMJ's user avatar
1 vote
3 answers
13k views

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

I was curious to know that if I flip my picture, which is taken from a rear camera, selfie, DSLR etc. horizontally then would it be the accurate depiction of how people see me in real life?
Anonymous's user avatar
  • 139
1 vote
5 answers
5k views

Why does this happen: objects which are surrounded by brighter objects appear darker?

Objects surrounded by a brighter area appear darker, and if the brightness of the area increases further, then the objects appear even darker? An ex: Sun spots appear black. I observed the following ...
kunal18's user avatar
  • 111