A red filter in black and white will brighten the brick to mild shades of grey and expose features in the masonry that are barely apparent in color. In landscape photography, the same red filter may be used to substantially darken blue sky and create deep shadow effects. This is particularly useful when photographing against a dark background like night or water. A yellow-green filter will do the same thing for green plants.
Filters are available in many colors; however, they are usually not as dark as expected. For example, a red filter should reduce light by about 50 percent, but often only reduces it by about 20 percent. The same rule applies to other colors as well. It's best to test filters on your camera to see how much they darken an object before you buy them. You can also use auto mode with different colored filters to see how they affect your image.
There are two types of color filters: neutral density (ND) filters and color compensating filters. Neutral density filters decrease the amount of light coming into the lens without affecting colors. This is useful when shooting landscapes where you don't want shadows from clouds or trees to appear in your photo. Neutral density filters come in various densities (most are between 1 and 2) to allow you to adjust according to the intensity of the sun or moon. Color compensating filters alter the color balance of your photos.
A filter is a clear substance that absorbs certain colors while allowing others to pass through. However, when blue light from a blue filter strikes a red item, it is absorbed and no light is reflected, giving the object the illusion of being dark. This is why photographers use filters to control what color light is allowed into their cameras.
There are two types of filters used by photographers: UV filters and ND (neutral density) filters. Both types of filters block out certain frequencies of light. However, not all filters do this to the same extent or for the same reasons. We will discuss these reasons in more detail below.
The purpose of using filters is to manipulate how different parts of the image look. For example, if you want objects that are far away to appear smaller, you can do this by using a broad lens with a filter on it. The filter will reduce the amount of light reaching the sensor, so less information about objects farther away will reach it. Thus, they will appear smaller in the photo. You can also use filters to make objects that are close up brighter or larger. Finally, you can use filters to change the color of light, such as when taking photos in low light conditions or at night.
In conclusion, filters can be used to make objects in your images look bigger, change the color of light, or reduce the amount of light that reaches the sensor.
Only red light is transmitted by a perfect red filter, while all other hues are absorbed. When seen via a red filter, an image including red, green, and blue would seem red and black. A red filter filters both green and blue light, allowing only red light to enter your eyes. Thus, colors like yellow, orange, and purple are not visible through a red filter.
What happens if you put on a red glass filter? You can't see any colors, but everything looks dark because all the red light is being transmitted back out again. So, only red things look red when filtered with a red glass.
What happens if you put on a green glass filter? You can still see some colors, but mostly they'll be green ones. Only green light is being transmitted back out again. So, only green things look green when filtered with a green glass.
What happens if you put on a blue glass filter? You can't see any colors at all! The only thing that's being transmitted back out again is more blue light. So, only blue things look blue when filtered with a blue glass.
That's why images viewed through colored glasses appear colored. If you wear red glasses then only red things look red; if you wear green glasses then only green things look green; if you wear blue glasses then only blue things look blue.