28

Question about thing like frame rate, resolution or dynamic range of the human eye and how they compare to cameras always have the same problems: The "picture" you see isn't a "single exposure", the eye is constantly moving and adjusting. The part of tee brain that handles vision is really good (and pretty big), it constantly combines the "frames" is gets ...


27

"Colour" is essentially a property of the distribution of wavelengths of visible light (as perceived by humans). Digital cameras only detect the amount of light at each pixel, they can't measure the wavelength and thus can't record colours directly. Colour images are produced by placing alternating red/green/blue filters in front of each pixel. By placing a ...


22

It depends on what you're asking exactly, if you're asking what focal length provides the same magnification as the naked eye (as in you hold your hand out infront of the camera and look through the viewfinder, your hand appears the same size as it would without the camera), then the answer depends on sensor size and viewfinder magnification, but the answer ...


17

That depends on the sensor size of the camera. "A lens is considered to be a "normal lens", in terms of its angle of view on a camera, when its focal length is approximately equal to the diagonal dimension of the film format or image sensor format.[4] The resulting diagonal angle of view of about 53 degrees is often said to approximate the angle ...


17

The image we can see from an infrared camera is what is known as a false color image. What this means is that a range of wavelengths in the infrared spectrum are rendered with a corresponding wavelength of visible light. Just as with visible light, a particular wavelength of infrared light can vary in intensity from just above black (shadows) to near ...


17

My monitor is calibrated (less than a month ago). I see the white/gold dress, but the highlights on the white piping have a blue tinge to me. However I have seen pics of the (supposedly) original dress, and it is a deep blue and black. To me, the only way I can reconcile this pic, and the pic of the actual dress is that if this pic was taken with a really ...


14

When you look through a viewfinder, a lens at around 50mm focal length will show objects at the same size as when you look at something with your eyes. You could test this by looking through the viewfinder with one eye, and looking next to it with the other eye. When you close one of your eyes, you will notice that your sight does not change, regarding the ...


13

If you look at the specifications of the human eye as if it's a camera, you're going to find it's pretty low-specced. Very low resolution in terms of pixels - very few megapixels - with most pixels concentrated in a very small area in the centre. Virtually no ability to distinguish fine detail outside of a small area in the centre of the frame. Horrible ...


12

Our eyes and brain do things on a daily basis that make LSD's effects seem relatively tame. One of the things our brains do is a color balancing activity of their own. No one knows why for certain, but its theorized we do it so that it would be easier to track prey as they dodge in and out of shadows (prey reflect the blue sky while in the shadow, so they ...


11

Human eyes see moiré in the overlapping of two regular patters. In photos you see the photographed pattern overlapped with the pixels, which form the second pattern. Of course you can see moiré with your naked eyes, but you need two overlapped patterns in the scene. Your eyes don't add one of them.


11

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 based on his method. In 1891, Gabriel Lippmann demonstrated full color images using a single sheet of black & white film, no filters, no colored dye or ...


11

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 term complicated stuff in our brains. That may sound a bit glib, but this is actually a complicated topic with whole books just scratching the surface and ...


9

The perceived color of an object depends on two elements: the intrinsic color of the object, and the color spectrum of the light shining on it. A red apple for example, will appear nearly black with a pure blue light shining on it. Depending on the difference in spectral density of different lights, the absolute perceived color of the red apple will change,...


8

The human eye is a very complicated organ, which only sees clearly for an angle of approx 2 degrees of the field of vision. The eye moves constantly focusing on different areas & the brain receives signals & converts these signals into the complete view that we see. Our angle of view would be approximately 180 degrees (forward facing) and ...


8

To me the image appears white with a bluish tint (perhaps even a light baby blue) and the gold. or brown. It just won't read as black no matter how hard I try to convince myself. I think its the black object behind it that makes it never go there for me. I can't reconcile the deeper blue of the actual dress with the slight blue cast in the image. It reads ...


8

Viewing these three images side by side from this article makes it fairly obvious what is going on with the viral photo: Choices about exposure and white balance determine how colors in a photo are perceived. Even black objects can be so overexposed as to over-saturate all three channels (RGB) and make black appear to be white. Amplifying the three color ...


8

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 to reverse it to see it how others would. (Otherwise any text in a photo would be backwards!) So it's the same when taking a picture of yourself. You might be ...


7

"The pattern caused by the shadows and the grill together looked very much like moiré to me" It was moiré. Two overlaying pattern causing combination patterns is what a moiré pattern really is. When moiré pattern appears in a digital camera, one of the patterns is the pixel grid of the camera sensor. As humans doesn't have a pixel grid in their eyes, a ...


7

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 spectrum are false color images. Similarly, images from Chandra, which observes the X-ray spectrum, can only be visualized by mapping its "tones" to the visible light ...


7

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 in water is below and the real sky is above. That's because it would be quite odd for the water to be brighter than the sky — and because without prompting, one ...


7

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 neatly equally spaced grid so you cannot define a spatial frequency for them (or at least there is a frequency range so the moiré is severely attenuated). Our ...


6

Red light, because your low-light vision uses a pigment called rhodopsin. This breaks down in bright light, but less so in red. It takes about 45 minutes to regenerate fully, which is why there's that period of re-adjustment. Using red similar to a darkroom "safe light" with black and white printing, because many photo papers were less sensitive to red/...


6

Yes, infrared photography does record infrared wavelengths. Usually, a filter is used to make sure no visible light gets recorded. Sensors and films are not based on human eye, so their limitations are different. We can see the infrared light on resulting photographs because it is displayed in some other color(s) than infrared. In photography, colors in ...


6

As a photographer, I understand both what I see (blue) and the likelihood that others don't "see" exactly what I see, for any number of reasons -- especially if you allow for different photos of the same subject taken under different lighting conditions and/or different white balance settings. If anything, I have a (completely unsubstantiated) belief that ...


6

The image has an obvious yellow colour cast. If i wanted to correct it, i'd put the eyedropper on the white flecks on the fabric in the lower left, which results in a blue/black dress. If we wanted to pull the blue tinge to a shade of white, we'd have to increase the yellow, and the image would look completely unnatural and clipped. So, no, there is no ...


6

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 impact on color accuracy and Leica had to give customers IR/cut filters for their lenses to resolve that. Extending to UV is difficult as glass in the lenses ...


6

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 CMYK what cameras, monitors and printers can do. In your detailed question, you basically ask, if choosing different RGB filters would accurately model human ...


6

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 photography. What it is done is that the received data is reinterpreted and re-coloured. There are not "official" colors to reinterpret the image, they can be simply ...


5

The human vision system is complex, involving both photo-receptors and neurons in the eye itself, in addition to complex processing in the brain. The main receptor of information from the retina is the lateral geniculate nucleus, a part of the thalmus located pretty much in the center of your head. This, in turn, routes information to the primary visual ...


5

The brain does the white balancing for us, and it's way more advanced than any software. The brain can for example do partial white balancing, i.e. it uses separate white balance on different areas. The brain also does object recognition of what you see, which is even more advanced, and then it uses that information to do the white balancing. I.e. a white ...


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