In the image processing, computer graphics, and photography, High Dynamic Range Imaging (HDR) is a technique that allows a greater dynamic range between the brightest area with the darkest of an image than standard digital imaging techniques. This wide dynamic range allows the picture to represent the range of intensity levels are more accurate in the real scenes, ranging from direct sunlight to the dim light of a star.
In more simple terms, HDR is a range of techniques aimed to show the contrast of the image. Karema non-HDR to take pictures at a single exposure with a limited contrast range. This causes loss of detail in bright or dark areas of an image, depending on how low or high the exposure setting. HDR will offset this loss of detail by taking multiple photos at different exposures and combining cleverly together so you will get a picture that represents both light and dark areas.
The two main sources of HDR imagery are computer renderings and merging of multiple photos Low Dynamic Range (LDR) or Standard Dynamic Range (SDR). Tone-mapping techniques - which would reduce overall contrast to facilitate the HDR image to be displayed on devices with LDR - can be applied to produce images with a local contrast is maintained or exaggerated (over) to get the artistic effect. It nih commonly used iphone user, in particular the application Instagram, and his friends.