A Study of effect of CRT gamma and white point on softcopy and hardcopy agreement

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Title: A Study of effect of CRT gamma and white point on softcopy and hardcopy agreement
Author: Kuo, Shih-Lung
Abstract: DTP (Desk Top Publishing) professionals rely on CRT displays to provide visual feedback to adjust or to proof color prior to hardcopy. Solutions are now appearing in the market to meet this need. But the proper CRT calibration is still not clear to the end users. The objective of this work is to study the CRT setting in terms of gamma and white point; and to explore gamma and white point's effects on softcopy (CRT displayed image) and hardcopy (CMYK printed image) agreement. A number of CRT calibration experiments were performed. Two SCID (Standard Color Image Data) images were used in this study to test the agreement between a softcopy and a hardcopy image. A number of color measurement devices and color management software packages were used in this study. Specifically, ColorTron was used in this study as the tool to calibrate the CRT. Adobe Photoshop, with the ColorSync 2.0 plug-in module was used in this study to implement the printer CMYK to CRT RGB transformation. ColorBlind was used in this study to generate printer and monitor profiles. CA-100 was used in this study as a colorimetric measurement device for data collection and image gamma analysis. By means of observer experiment conducted under dark ambient light, it was found that the different CRT profiles do influence the color transformation between printer CMYK and CRT RGB; the system's default CRT profile (gamma=1.8, whit point=D50, out of 6 CRT profiles tested) cannot achieve the best match between CRT and hardcopy. The optimum CRT profile for the best match was not to be found because of the influence of the keyness of the image itself.
Record URI: http://hdl.handle.net/1850/13568
Date: 1997-11

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