作者
Hossein Izadan
发表日期
2007
机构
University of Leeds
简介
The main aim of this research was to investigate the possible uses of digital image scanning to assess the colour and colour fastness of textiles. This method has the potential to be a simpler alternative to camera based colour fastness assessment, for example'by the DigiEye system.. The scanning device used was an Epson Perfection 2400 Photo scanner, a mid-range quality device. The scanner was operated in· two different modes, 24 and 48 bits colour resolution and was calibrated by adjusting its setting, testing its repeatability for colour measurement and examining the spatial uniformity of response of the scanner. The results showed that the spatial uniformity of the 'scanner response was excellent for the majority of the scanning area but less uniform for the areas along its scanning borders. The repeatability of the scanner values for the colour measurement purposes was reasonable. The colour and colour fastness determination by the 24 and the 48 bits scanner modes indicated that there were no practical benefits to the use of the 48 bits. The colorimetric response of the scanner was characterised with the XYZ and the L*a*b* approaches in which the RGB responses of the scanner were transformed to the XYZ tristimulus values and to the L*a*b* values, respectively. It was shown that pre-treatment of the data by linearisation against either luminance or mean reflectance gave very good results with the XYZ approach to scanner. characterisation and that linearisation against L* gave excellent results for the L*a*b* approach to scanner characterisation. In the characterisation of the scanner two different techniques for parameter …
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