影像品質的評鑑可分主觀與客觀兩大類。客觀評鑑都以量化數值為依據，如印刷滿版濃度等等，皆為客觀評鑑之指標，只要量測過程能遵守標準校正程序，其評鑑結果都具公信力。而主觀評鑑需由人類視覺觀測，以心理物理實驗法則，歸納出感知上的優劣，但若觀測者之穩定度不佳，其評鑑結果將受質疑。本論文所研究之重點即為分析觀測者之訓練背景對心理物理實驗結果穩定度之影響，尤其著重在影像品質主觀評鑑過程中，不同訓練背景之觀測者。結果顯示，有受過專業色彩相關課程訓練之觀測者其視覺觀測之穩定度較佳，雖然觀測者之背景與其偏好之影響非本研究之主題，但觀測者之穩定度確定可增加評鑑數據的公信力。
Image quality can be assessed subjectively or objectively. Quantitative measurement, like solid ink density in printing, is used as the index for objective assessment. Psychophysical method is commonly used in the experimental design for subjective assessment. However, the observer stability may influence the precision of the experimental results. In this study, the observers’ repeatability is under investigation in regarding to the background of the observer in taking color related courses. The results indicate that by having the background in color related courses, the repeatability of the observer is better than not having it
