Abstract Reflectance Transformation Imaging (RTI) has been increasingly used for the recording, documentation and analysis of cultural heritage. A series of images of a static object, taken in raking light at constant exposure, is synthetised using Polynomial Texture Mapping or the Hemispherical Harmonics fitter, resulting in polynomial texture maps or RTI images. These visualisations capture colour and texture information, reveal low relief detail and emphasise surface topography. RTI has found several applications in the study of painted surfaces, yet it has not been utilised for the study of historic interiors, which are more commonly evaluated through Architectural Paint Research, a process of empirical examination of the painted finishes to an historic structure to establish its decorative history. Typically, this is achieved through a combination of archival research, paint and substrate cross-section analysis, and through the careful layer-by-layer exposure of the accumulated paint stratigraphy so that the texture, sheen and colour of each paint layer can be observed. This study evaluates the use of RTI as an alternative means for the study of historic wall paintings, with an emphasis on the revelation of overpainted designs. Considering the efficiency of RTI in recording and documentation of subtle surface variations, this research explores its use in texture comparisons between exposed, restored and covered areas of the wall painting as a diagnostic tool and for appraising condition.

中文翻译：

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反射变换成像在建筑涂料研究和历史室内研究中的潜力：以英国Stowe House为例

摘要反射转换成像（RTI）已越来越多地用于文化遗产的记录，记录和分析。使用多项式纹理贴图或半球谐波拟合器，以恒定曝光在连续光照下拍摄的一系列静态对象图像，生成多项式纹理图或RTI图像。这些可视化捕获颜色和纹理信息，揭示浮雕细节并强调表面形貌。RTI在涂漆表面的研究中发现了几种应用，但尚未用于历史室内装饰的研究，通常通过“建筑涂料研究”进行评估，这是对涂饰面漆进行历史检查以建立历史结构的过程它的装饰历史。通常，这是通过档案研究，涂料和基材横截面分析的结合，以及通过对累积的涂料地层进行仔细的逐层曝光来实现的，从而可以观察到每个涂料层的质地，光泽和颜色。这项研究评估了RTI作为历史性壁画研究的替代手段的使用，并着重于粉刷过度的设计的启示。考虑到RTI在记录和记录细微表面变化方面的效率，本研究探索了RTI在壁画的裸露，修复和覆盖区域之间的纹理比较中的用途，以此作为诊断工具和评估状况。通过仔细地逐层暴露累积的涂料地层，可以观察到每个涂料层的质地，光泽和颜色。这项研究评估了RTI作为历史性壁画研究的替代手段的使用，并着重于粉刷过度的设计的启示。考虑到RTI在记录和记录细微表面变化方面的效率，本研究探索了RTI在壁画的裸露，修复和覆盖区域之间的纹理比较中的用途，以此作为诊断工具和评估状况。通过仔细地逐层暴露累积的涂料地层，可以观察到每个涂料层的质地，光泽和颜色。这项研究评估了RTI作为历史性壁画研究的替代手段的使用，并着重于粉刷过度的设计的启示。考虑到RTI在记录和记录细微表面变化方面的效率，本研究探索了RTI在壁画的裸露，修复和覆盖区域之间的纹理比较中的用途，以此作为诊断工具和评估状况。