长久以来，当数字技术开始全方位引入电影的制作流程时，尤其是在DI（Digital Intermediate）中，查找表（LUT）一直扮演着重要的角色。在这个领域，经典的色彩管理流程将不是那么的灵活，因为许多时候对画面的修正不仅仅是技术上的，更多的也是从经验感官上出发进行调整。为了加速修正很可能在一个特定场景下拍摄的影片，应用1|3D LUT会特别的方便与迅速。但是不幸的是，由于历史原因，硬件（诸如Thomson LUTher、da vinci R4K等电影矫色设备）与软件（诸如Apple Shake、Fusion、Nuke等后期工具）之间的查找表格式并不通用，导致数据重用与可移植性非常差，不得不手工写转换工具转换，比较麻烦。为此，AMPAS与ASC准备推出基于XML的通用LUT格式。目前这个标准还是处于草案阶段，所以相关文档还没有公布。
我编写了一个对应于这种LUT格式的C++读写库，基于xercesc与OpenEXR half用于支持FP16浮点格式，仅供学习，严禁用于商业产品或者其他用途。
When the digital tech was involved into cinematic production workflow especially the DI, LUT always plays an very important role in it. Here the classical color management workflow will be not very flexible, because the color correction is not only according the device but also about the feeling. To accelerate this progress, it’s very fast to use a 1|3D lookup table. But unlucky, the format of LUT between different hardware ( Thomson LUTher, da vinci R4K ) and post production software ( Apple Shake, Fusion, Nuke etc. ) is not compatible at all, we have to manually convert from one format to another. To solve this problem, the AMPAS and ASC are ready to implememt a XML-based common LUT format. This standard is still a draft now, so the specification have not been published now.
I made a C++ R/W library based on xercesc and OpenEXR half to handle this kind of LUT, only for personal study, must not be used in any kinds of commercial proposes.
Go To http://code.google.com/p/aalut/
© 2009 Academy of Motion Picture Arts and Sciences (A.M.P.A.S.) All rights reserved.
© 2009 American Society of Cinematographers ( ASC ) All rights reserved.
[This project has been evaluating by the member of ASC/AMPAS, because of the copyright, I have to close the project on google, Sorry.]