The simple answer is that an underexposed image will appear excessively dark due to insufficient light, whereas an overexposed image may appear excessively bright or even washed out with light.
Very broadly, an underexposed image is too dark, while an overexposed image is too light. Underexposed images generally have "blocked" shadows (no visible detail), while overexposed images generally have blocked highlights.
That said, everything is relative. If you are making a low key portrait or other image, you may deliberately underexpose to block the shadows and have the highlights be dark for a moody look. High key is just the opposite, the object often being that there should be no blacks at all, only grays and whites.
Usually, though, in general Photography, the effect we're after is called "long scale," where there is some dark detail visible in all but the deepest shadow, and some light detail visible in all but the specular highlights, such as the reflection of sun off chrome. This is labeled "correct" exposure for the whole scene. Depending on whether you are working in film or digital, transparency or negative, black and white or color, "correct" exposure may be different for each despite the scene remaining the same!
As an old black-and-white man, I was trained to "expose for the shadow and develop for the highlight," which is a form of image manipulation not available if shooting in color. Conversely, when shooting transparency (slides) we usually expose for the highlights and let the shadows "fall." In my experience, this technique also works well with digital, which tends to "blow out" or "block" the highlights, while we can usually open up the shadows because …
… to further complicate things, today we have image manipulation programs such as Photoshop® which allow us to take considerable liberties with the original, whether it was under, over, or "correctly" exposed. (A tip: if your camera allows it, when in doubt try "bracketing," which is making at least three exposures; one at the exposure you think is right, then one over and one under, how far over/under depending on what your medium is, but usually not more than one full f/stop.)
Severe overexposure is when too much light has reached the film, causing the negative density to exceed the tolerances which allow it to still make a usable print. The denser negative will reduce light transmission onto the paper, causing it to be lighter. Compensating by reducing print exposure will not help much. Highlights will be "blocked up" (basically turn into white patches with no detail) and contrast will be low. Changing the paper grade may help somewhat. Slight overexposure will still render a usable print that may be enhanced by changing the paper grade but can often be detected by the trained eye.
With respect to transparencies (slides) too much exposure lightens the slide and there is nothing that can be done to it since it is the final product meant for viewing. Worth noting is that slide film has less tolerance to exposure error than negative film.
Shadows will be too dark and highlights too light with result: lack of details. Technically it is mapping midtones and 3/4 tones to or almost pure black/white colors without details.
Exposure is the combination of shutter speed and aperture used to expose the image sensor in a digital camera. When the image sensor receives the right amount of light, your picture comes out correctly exposed. The camera's light meter determines how big to open the aperture (the hole to allow light in) and for how long (the shutter speed). If the image sensor receives less light than it requires, your picture comes out under-exposed. If the image sensor receives more light than it requires, your picture comes out over-exposed.
The structure of the leg muscle is similar to the heart muscle in their makeup. There are studies that have shown that leg muscles can be injected into the heart.
Robespierre ruled over a representative government, while Napoleon ruled over a dictatorship
theoretically maybe.....but i doubt seriously if that would work
In order to find a high resolution world map, you should search for high resolution world map on an online search engine under "images." Most image websites will allow you to specify the resolution of the image.
There really is no difference
the difference between 17 and under 17 years old is that under means younger than 17 and 17 is just 17.
why is image reversed under a microscop
difference between Indian and English law under consideration
There's no difference their both under the Department of the Navy.
Under Exposed - 2011 was released on: USA: 29 September 2011
The histogram is simply a graph that allows you to judge the brightness of an image. You can think of the area under the graph as comprising all the pixels in your captured digital image. The left side of the histogram depicts how many "dark" pixels you have captured; the right side, how many "bright" pixels you have captured. The histogram allows photographers to tell at a glance whether they have exposed their photo the way they wanted to. It can also alert them to under- and over-exposed situations.
the difference between the third and over the third or under the third line is that they are difference
properties of the image under dissecting microscope
Involuntary is not under your control while voluntary is.
no difference,cyanobacteria comes under eubacteria
population