Recording and documenting the chromatic information of architectural heritage

One essential approach in preserving architectural heritage is the documentation of 3D geometries and surface textures of historic buildings. For example, precise colour information, excluding lighting effects, is an intrinsic property of the surface materials of building interiors and exteriors. However, while colour information has been recorded for small sample areas, it has not been accurately documented on the scale of entire building surfaces. This is critical, because building materials decay and their colours fade with time. The goal of this project is to develop a method to assist in recording and documenting the chromatic information of interiors and exteriors of historic buildings with low cost and high efficiency. The method takes advantage of emerging high dynamic range imaging (HDRI) technology, which can store rich information about colour and illumination through digital photography. By recording the colour information, in addition to the geometry and texture information obtained through other existing technologies, we can achieve more complete documentation for architectural heritage. In this paper, we discuss an overview of the problem and present our algorithms for utilizing computer vision techniques to retrieve chromatic information of historic buildings. We also present and discuss our experiments and results of applying our method to studies of lab objects and the Hall of Supreme Harmony in the Forbidden City, Beijing.     

LEDs as a tool to enhance faded colours of museums artefacts

A procedure to enhance the faded colours of museums artefacts is presented. The method is based on adjusting the spectral profile of the light while maintaining a given white colour of the illumination. The procedure is tested using colour LED clusters and a series of damaged samples and their good condition counterparts. The intensity of the three components of four feasible LED clusters is computed in order to produce white illumination metameric to a white LED light source taken as a reference. Colorimetric calculations are performed to model the colour changes undergone by target colour samples using illumination based on colour LED association with respect to the white LED reference. The model is based on CIELAB specification and allows to optimize the choice of three-colour LED associations that modify the hue and the saturation of a few target colour areas of illuminated samples while other areas are left moderately desaturated. Modelling and experimental visual validation were practically obtained by adjusting the intensity of five calibrated colour LEDs, blue, cyan, green, amber and red, accommodated in a light booth. A visual validation was conducted asking 20 observers to rate the colourfulness appearance of aged inkjet prints under every LED cluster with respect to the colourfulness of their original counterparts under the reference white LED source. The visual assessments agreed with the colorimetric predictions. Finally, a demonstration is shown of the feasibility of the method by simulating the rejuvenated appearance of a natural history specimen of which the museum possesses two differently aged items.     

室内设计中光照与色彩的应用(英文)

The application of colour is not as simple as we normally think. Decoration, painting or drawing are thefirst few concepts come to our mind as soon as we mention colour. In fact colour also deeply influents people’s everyday behaviour. An article points out that colour does affect our actions and reactions in traffic as well as in interiorenvironments. Colour can create conditions that can cause fatigue, increase stress, decrease visual perception, damageeyesight, increase possible worker errors, and negati...     

Detection of Misconceptions about Colour and an Experimentally Tested Proposal to Combat them

We study the misconceptions about colour that most people hold, determining the general phenomenological laws that govern them. Concept mapping was used to combat the misconceptions which were found in the application of a test specifically designed to determine these misconceptions, while avoiding the possible misleading inductions that could have arisen from the use of everyday language. In particular, care was taken to avoid the distorting effect that the use of the verb ‘to be’ applied to coloured objects could have on the responses. The misconceptions found were shown to have an internal consistency in the form of authentic mini-theories (implicit theories). We compared experimentally the results of two different teaching methods applied to combat these misconceptions. This study was conducted with 470 undergraduates of the University of Extremadura. We analysed the persistence over time of their learning made to overcome those misconceptions. The students were divided randomly into an experimental group (EG) and a control group (CG). To combat their misconceptions, EG were taught following a method based on the use of concept maps, and CG were taught following traditional teaching methods. The results of a pre-test and a post-test were compared for the two groups, finding statistically significant differences. The results allowed the principal working hypothesis to be accepted—concept maps are learning tools which foster conceptual change and allow misconceptions to be eradicated via meaningful learning maintained over time, i.e. EG acquired a relative long-lasting gain in learning that was superior to that acquired by CG.     

绵竹年画《老鼠嫁女》的装饰特色

本文主要通过对绵竹年画《老鼠嫁女》在作品含义和作品在构图、造型、色彩上的解析 ,总结该作品在装饰艺术上的特色和成就     

Powerpoint 电子演示课件的页面设计

本文就页面布局、色彩设计、文字设计、链接层次设计等方面,对Powerpoint电子演示课件的页面设计作一些探讨,具有一定的实用性。     

Leap of Faith: An Interview with Max Velthuijs

The now late great Max Velthuijs was filmed in April 2004 discussing his work with Victoria de Rijke and Howard Hollands, who began the interview expecting Max to be working under certain artistic and cultural influences, none of which seemed to be the case! Max describes what brought him home to Andersen Press, the freedom of children’s picturebooks and his particular way of working, the irony of the white canvas, his attachment to certain symbolic motifs such as apples and blackbirds, and his affinity with the creatures that make up the universally popular and internationally acclaimed Frog series.This piece draws on many voices: those of Max Velthuijs, (represented here in italics), the interview questioners Victoria de Rijke, Howard Hollands & camerawoman Rebecca Sinker (in bold type), and comments (in ordinary type) drawing upon Joke Linders’ biography Ik Bof dat ik een Kikker Ben (Glad to be a Frog) Leopold, 2003, kindly translated into English by Lena Winter.     

也谈"白日"与"红日"

有人认为古代的“白日”不表示白色。这种说法值得商榷。古人直觉中的太阳在一定时段中是白色的,而“白日”在使用中也有白色的意义。用“白日” 指称红色的朝阳、夕阳,是一种习惯性的沿用。而唐以后的“红日”取代“白日”则是太阳与红色都具有积极的象征意义造成的。     

Non-destructive methods for chemical, optical, colorimetric and typographic characterisation of a reprint

The quality of production (e.g. paper, typesetting, reproduction of illustrations, printing and bookbinding) of a book (reprint) is very important. The quality of a 1978 reprint of a book from 1921 was studied using standard and non-destructive testing methods such as microscopic and spectroscopic techniques. Chemical, physical and colorimetric properties of the papers, colour differences of the prints and typographic tonal density were analysed. Results showed that the reprint is not an identical copy of the original. Some of the differences in the reprint compared with the original (e.g. typographic tonal density) could easily have been avoided while others (e.g. structural and optical properties of paper, colour prints) are unavoidable, mainly because of the influence of internal and external factors on ageing. Ageing influences the properties of paper and colour print: optical and colour properties deteriorate and colour fades. It is concluded that precise and systematic evaluation of the properties of an old book should be carried out before a reprint is prepared. The results of the research, using non-destructive methods such as microscopy, spectroscopy and image analysis, are useful for characterising the properties of paper and printing ink, typography and reproduction of illustrations.     

松下画王彩电的视放电路

本文分析了松下画王彩电视放电路的原理和特点。