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Questions tagged [human-vision-system]

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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 ...
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 ...
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:...
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 ...
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?
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 ...
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 ...
1 vote
1 answer
108 views

Is there any data or theory about human visual system to identify details under noise?

For one clean image, one person can identify every details at first. Then white Gaussian noise is added to the image. With low noise level, one person can still identify every details even though ...
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?
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 ...
0 votes
1 answer
121 views

Improving images for human vision

If human eyes are more sensitive to red, green more than blue, also more sensitive to brightness than color. If there are 24 bits per pixel, are the images modified behind the scenes for human vision? ...
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-...
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 ...
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 ...
0 votes
2 answers
300 views

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

I've heard that human cone cells can detect only one color, so it's more like a Bayer sensor than a Foveon. So, if the human eye is close to the Bayer sensor, I wondered if color moire would occur in ...
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 // ...
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 ...
0 votes
2 answers
131 views

Is it possible to make an monitor that can output colors perfectly? [closed]

We have come from long way from my rather bad IBM E74 monitor with terrible color reproduction to the brand new monitors with 14 Bit HDR. But will we ever see an monitor that can output colors that ...
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?. ...
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 ...
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 ...
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 ...
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 ...
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?
0 votes
1 answer
93 views

How can I convert a stack of images with increasing intensity to a scale that will let humans see the difference in intensity?

I have a plethora of tiff stacks from a camera with a CCD attached, I am observing the increase in the intensity of my image stack over a change in concentration, the problem that I am having is that ...
-4 votes
2 answers
184 views

How to know if a photo is good -people judge [closed]

I am new here,I came here because I have a personal issue but I think it's more than my issue because even photographers or a models wants to know the others people opinion about their photo.How do ...
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 ...
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 ...
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 ...
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 "...
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 ...
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 ...
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 ...
0 votes
2 answers
557 views

Is it possible to take a self-portrait using a flip rotatable screen DSLR involving the hand ONLY?

Is it possible to take a self-portrait using a flip rotatable screen DSLR for example, like Nikon D5200 and involving the hand ONLY? I haven't found much research on this on the internet so was ...
0 votes
1 answer
2k views

Which one is the real car and which one is the reflection?

I think photo above is one of the best photos in the world. See once, then turn the image around 180°, then see again... Which one is the real car and which one is the reflection? How can you tell?
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 ...
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, ...
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 ...
0 votes
1 answer
568 views

What's the ranges of ratios of Focal Length to Sensor Height to approximate a human eye's view? [duplicate]

Given this formula for calculating the distance to an object as long as you have a picture of the object and know the actual height of the object... ...
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, ...
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 ...
1 vote
1 answer
1k views

Can anyone reproduce the white/gold vs. blue/black dress's binary perception effect with a totally different subject?

Yesterday I asked about the strange Internet phenomenon of the dress which people very strongly perceive as either white and gold or blue and black. Here is the original: There are many theories ...
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 ...
0 votes
1 answer
316 views

Color schemes and perception: If L*-linearity does not imply perceptual intensity linearity, then what is the best metric of perceptual intensity? [closed]

This question was in part motivated by this MathematicaSE question and Matteo Niccoli's geophysics blog post on color schemes. The underlying concept of Niccoli's perceptually-balanced color schemes ...
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. ...
0 votes
2 answers
223 views

Why human eye doesn't exhibit aberrations?

Eye's optical system is composed of single lens and is capable of producing very sharp results, but if I use single lens (monocle) with my camera I'll get soft image.
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 ...
0 votes
1 answer
131 views

Take a photo and print it to show approximate view of a human from a distance?

If I want to take a photo from about 600' away from my front door, and I want it to emulate what a person would see with unmagnified view, what mm would I set my camera lens length AND then what size ...
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 ...
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 ...