|
OpenEXR is a high dynamic range imaging image file format, released as an open standard along with a set of software tools created by Industrial Light and Magic (ILM), under a free software license similar to the BSD license. It is notable for supporting 16-bit-per-channel floating point values (half precision), with a sign bit, 5 bits of exponent, and a 10-bit significand. This allows a dynamic range of over 30 stops of exposure. Both lossless and lossy compression of high dynamic range data is also supported. ==OpenEXR Overview== A full technical introduction of the format is available on the OpenEXR.org website.〔 OpenEXR, or EXR for short, is a deep raster format developed by ILM and broadly used in the computer-graphics industry, both visual effects and animation. OpenEXR's multi-resolution and arbitrary channel format makes it appealing for compositing, as it alleviates several painful elements of the process. Since it can store arbitrary channels—specular, diffuse, alpha, RGB, normals, and various other types—in one file, it takes away the need to store this information in separate files. The multi-channel concept also reduces the necessity to "bake" in the aforementioned data to the final image. If a compositer is not happy with the current level of specularity, he or she can adjust that specific channel. OpenEXR's API makes tools development a relative ease for developers. Since there are almost never two identical production pipelines, custom tools always need to be developed to address problems, e. g. image manipulation issue. OpenEXR's library allows quick and easy access to the image's attributes such as tiles and channels.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「OpenEXR」の詳細全文を読む スポンサード リンク
|