![]() Under such situations, our central vision also begins to depict less detail than just off-center. In extremely low light, such as under moonlight or starlight, our eyes actually begin to see in monochrome. Cameras record images almost perfectly symmetrically. Each eye is more capable of perceiving detail below our line of sight than above, and their peripheral vision is also much more sensitive in directions away from the nose than towards it. Other important differences with how our eyes resolve detail include:Īsymmetry. This has an important but often overlooked implication for photographers: even if a photograph approaches the technical limits of camera detail, such detail ultimately won't count for much if the imagery itself isn't memorable. The end result is a mental image whose detail has effectively been prioritized based on interest. For example, a telephoto lens has a longer focal length than a standard portrait lens, and thus encompasses a narrower angle of view: With cameras, this is determined by the focal length of the lens (along with the sensor size of the camera). Other topics might include depth of field, stereo vision, white balancing and color gamut, but these won't be the focus of this tutorial. The above are often understood to be where our eyes and cameras differ the most, and are usually also where there is the most disagreement. This tutorial groups comparisons into the following visual categories: Subsequent sections will try to distinguish the two whenever possible. However, this shouldn't discourage us from comparing our eyes and cameras! Under many conditions a fair comparison is still possible, but only if we take into consideration both what we're seeing and how our mind processes this information. Each of the bands will appear slightly darker or lighter near its upper and lower edges - even though each is uniformly gray. Mach Bands: Move your mouse on and off of the image. The missing dot will rotate around the circle, but after a while this dot will appear to be green - even though no green is actually present in the image. False Color: Move your mouse onto the corner of the image and stare at the central cross.
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