![]() ![]() A curve gives more control over the process, but may need a lot of fine-tuning. The simplest would be a negative contrast value in the Exposure tool to reduce (or rather to redistribute) the dynamic range, however the effect would most likely appear flat and unappealing. There are alternative ways of compressing the dynamic range using other tools. The tool operates in RGB space and is applied right after Noise Reduction and Haze Removal, but before other tone curve adjustments such as the Exposure controls. ![]() The algorithm uses two parameters to control the compression (α and β) which can be tuned by the "detail" and "amount" sliders of the tool, respectively. This algorithm is often simply referred to as "Fattal", e.g. The Dynamic Range Compression tool uses the latter approach based on the Gradient Domain High Dynamic Range Compression algorithm developed by R. clipping highlights), or compress the data so that it fits the destination range. In general there are two ways to handle dynamic range changes: either discard a portion of the data outside the destination range (e.g. As such, photography and image processing needs to deal with mapping high dynamic ranges to lower ones. This is very different from the fixed, lower dynamic range of your camera sensor and the (usually even lower) dynamic range of your monitor. The human visual system has an adaptive and wide dynamic range (you can see faint stars at night but also bright skies during day). The dynamic range of a scene can easily exceed the dynamic range of the "sensor" that captures the scene. In contrast, an indoor scene with a visible sunny sky through a window is known as a high dynamic range scene. An outdoor scene on a very foggy day commonly has very little difference between the brightest and darkest elements, which is known as a low dynamic range scene. In photography it commonly refers to the ratio of the brightest element of a scene to the darkest. Dynamic range is the ratio of the largest to the smallest value of a measured signal. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |