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Aliasing

What Is Aliasing and How Does It Relate to Digital Photography? In photography aliasing is a form of distortion that occurs when two elements of the signal being processed to form a digital image become indistinguishable from one another. Aliasing often appears in an image in the form of moiré or false colouring. Many digital cameras feature a built in ‘anti-aliasing filter’ to counteract the effects of aliasing by preventing high frequencies of light from reaching the sensor. This introduces a small amount of blur to detailed areas of an image that can prevent aliasing from occurring. The image...

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Astrophotography

What Does Astrophotography Mean? Astrophotography is the art of photographing nighttime skyscapes and astrological objects such as stars and planets in the night sky. Successful astrophotography requires knowledge of various photography techniques such as use of long exposures for creating star trails, knowledge of camera sensitivity to avoid excess noise levels in photographs of dark skies, and the use of camera steadying equipment such as tripods to aid in the capture of sharp long exposure images. Astrophotography techniques can even be used to capture images of objects that would otherwise be invisible to the naked eye for example far away...

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Color Palette

What is a Color Palette When Talking About Photography and Image Editing? Also referred to as ‘palette’ the term ‘color palette’ describes the entire range of colors that can be rendered by a digital device such as a camera LCD or a computer monitor, or the range of colors contained within a specific image. A computer monitor may have a color palette of 16 million colors, an image on the other hand often contains a much smaller number, often 256. The term is also used to describe a collection of colors, usually displayed graphically in RGB triplets, which a...

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Fill Factor

What Does Fill Factor Mean When Talking About Photography? Fill factor is the ratio of the light sensitive area of a pixel to the total area of a pixel on a digital imaging sensor. The higher the fill factor, the more sensitive a sensor is to light. Sensitivity directly effects the ability of a camera to capture images in low light situations without having to use either long exposure times, which can lead to loss or sharpness, or high ISO levels which can lead to excess noise. Light sensitivity and performance is one of the most important factors to...

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Fill Flash

What Does Fill Flash Mean When Talking About Photography? In photography fill flash is light, produced by a flash unit which fills in a darker area of an image. Fill flash is not intended to overpower the main light, but bring out the detail lost in shadows. Fill flash is particularly useful in situations where the image subject is backlit by bright light, for example shooting a subject with the sun behind them. Without fill flash the dynamic range of such a scene would be to high to be captured in a single image, causing the subject detail to...

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Fill Light

What Is the Definition of Fill Light in Photography? Fill light is form of supplementary light mainly used to lighten shadows in an image. Fill light is often used in portrait photography to create a contrast between the image subject and image background giving the scene a sense of depth despite the final product being 2 dimensional. In this situation the use of fill light also reduces the overall dynamic range of the scene allowing for easier selection of the exposure settings required to capture an image. When fill light is correctly applied it does not significantly impact the main...

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Flash Exposure Compensation

What Is Flash Exposure Compensation When Talking About Photography? In photography flash exposure compensation is a feature that allows the photographer to add exposure compensation to output power of their flash units. Flash Exposure Compensation can be + (plus) or – (minus) in increments of 1/3 EV (exposure value). It is important to note that flash exposure compensation effects the flash output only, the cameras exposure settings remain unaffected. This allows a photographer to reduce dynamic range by brightening dark areas of an image without effecting the exposure or brighter areas. Flash exposure compensation can only be used in...

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Light Painting

What Is Light Painting and How Is It Used in Photography? A ‘light painting’ is an image that is created by capturing a long exposure of a dark scene that contains a moving light source. By moving the light source within the scene whilst the photographic medium is being exposed the photographer is able to produce an effect which resembles the brush strokes made by an artist’s paint brush, only composed entirely of light. A classic example of a light painting is writing your name using a sparkler at a firework display. Light Paintings can be created by capturing...

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Metadata

What Does the Term Metadata Mean When Talking About Photography? Metadata when related to digital photography refers to a set of data that describes an individual image file. Metadata is stored when an image is taken and can contain information on where and when an image was captured, specific exposure information, and even information related to image ownership and copyright. The amount of metadata captured alongside an image can be defined within a cameras settings allowing a photographer to taylor the metadata recorded to their specific needs. In post processing and image storage metadata can be used to filter...

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Multi-Pattern Metering

What Is Multi-Pattern Metering and What Is It Used for When Taking Photographs? ‘Multi-pattern metering’ refers to a metering mode selectable on a camera which is designed to meter a scene accurately in challenging lighting situations. Multi-pattern metering reads light levels in multiple areas or ‘zones’ within a scene and compares the results to calculate exposure settings that will produce the clearest exposure of in focus areas. Multi-pattern metering is particularly useful in challenging lighting situations, for example backlit subjects. In this situation multi-pattern metering can ‘sense’ the difference in light between the subject and background and compensate for...

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