The basics of photographic exposure.

First, what is the exposure of such things often do we encounter it? .We see an exciting scene - may be snow-capped mountains or the charming New England Autumn, when we often grabbed the camera, the piece of scenes captured on camera. .However, we often get is a depressing image, the original scene in which a variety of <H3 class=bt1 align=center>, what is the exposure <H3 class=bt1 align=center> <P class = txt .> Here we often encounter these situations it? .We see an exciting scene - may be snow-capped mountains or the charming New England Autumn, when we often grabbed the camera, the piece of scenes captured on camera. .However, we often get is a depressing image, the original scene in which a variety of images did not take it. .If we use color film to film, see is all those wonderful bright color into a pale boring boring. .If the shot is black and white film, photographs will be filled with dead faded gray tone in general. .Each of us may encounter this situation, we always inexplicably, more or less lost in the original field can see those bright colors and tones. .Crux of the problem is that we are not properly exposed film, we are not overexposed to the scene is its lack of exposure. .Even our most advanced camera offers a very simple built-in light meter, and even offers auto-exposure function, we will unwittingly commit such errors. .So these security metering system unparalleled in the end it went wrong? .The answer is very simple, light meter is not wrong, wrong is our own! .Is true. .They will read the meter points to anything. .However, the key is to know where the light meter should point to, and how to understand the read data. .Understand this principle, will know the trick lies. .The world's most intelligent meter can not be perfect in their own exposure, except as a photographer we will point it to the correct location of the scene, and the flexibility to use its data. .When we correct the exposure of a color film, the resulting photos or slide all the bright colors are supposed to be pure. .Similarly, when we exposed a black and white film, the last photo of all the tone should be very clear. .The trick is to know how to correct the exposure of the film. .This lesson describes the following: How do you know the location of meter should point; how to interpret the meter display. .To help fully understand the contents, here again how the exposure of black and white film from the basics to start. .Once you know how to light black and white film, color film exposed the problem how will be solved. .Well, the following began to talk about how to master the skills it the perfect exposure. .First, we should be exposed when a black and white film of all to understand. .Then, the problem then transferred to the color film up. .We know that three black and white to color film emulsion, based on this three-tiered black and white emulsion with the three primary colors, and are generated from the RGB color images. .. </ P> <P class=bt2 align=center> black and white film exposure of what happens when </ P> <P class=txt> we already know that when light shines into the emulsion, the silver halide crystals occur in small .change, when development time by changes in light exposure and the formation of black crystal metallic silver crystals. .The results frame in the area will be a light ray into a dark black film on the silver region. .Frame that are not affected by light exposure in the area what will happen? .The silver halide crystals in these regions did not change in the development process will be washed away. .Therefore, the frame has not been in the area of light exposure on the film becomes an empty area. .The only remaining area in the transparent acetate film base film. .To better understand this, and we take a look at two very extreme cases. .First consider the whole frame when we are exposed to bright light in what happens when. .For example, we accidentally opened the camera, the film exposed to bright sunlight. .When developing such a film would happen? .Almost all of the silver halide crystals are into black metallic silver, the result of the film is all black. .Second, consider that when we develop a film without any exposure what happens when. .For example sometimes we can not determine whether a roll of film shot before, for safety reasons, we develop them. .If the volume has never been exposed, will get a full load of transparent film - all of the silver halide crystals during development have been washed away, and the rest, it is only a transparent acetate film base. .The two extreme cases are easy to understand, let's consider the real life situation that may arise. .When we take a picture when the exposure of a film, what will happen? .Light will fall in some regions on the film, the weak point of light will fall some other regions, and in some regions do not have any lights on, which appeared the following results:.