| 题名 |
廣告燈箱彩白彩UV輸出色彩管理與色彩品質研究 |
| 并列篇名 |
A Color Management Application and Color Quality Evaluation Research of the 4C-W-4C UV Inkjet Printed Outdoor Advertising Light Box |
| 作者 |
戴孟宗(Tai, Mengtsung) |
| 关键词 |
UV印刷 ； 色彩管理 ； 色彩品質 ； Pantone色彩系統 ； UV Printing ； Color Management ； Color quality ； Pantone Color System |
| 期刊名称 |
中華印刷科技年報 |
| 卷期/出版年月 |
2022（2022 / 05 / 01） |
| 页次 |
54 - 70 |
| 内容语文 |
繁體中文 |
| 中文摘要 |
戶外廣告燈箱是不易控制色彩品質的，原因是「戶外」照明的不可控制性，「燈箱」同時是反射式與透射式的顏色載體，再則燈箱內部的光源種類變數，一般燈箱以「UV彩白彩」的三層噴墨方式輸出，尤其是夜間透射式所呈現的顏色是經由彩色、白墨和彩色三層的結果，如何控制好色彩的表現是極為重要的課題。本研究目的在分析UV噴墨輸出的ICC Profile對於廣告燈箱色彩的準確度、可正確複製色彩能力與色域大小的相關程度，並以廣告設計業者最為熟悉的PANTONE Formula Guide 4.0 Coated色票指南為評估工具，評估不同階調白墨與4C彩色組合輸出的ICC Profile，對應至PANTONE色票結果。研究採用準實驗法（Quasi Experiment），自變項為不同階調白墨與彩色組合UV輸出的ICC Profile，依變項則是彩白彩廣告燈箱色彩表現的準確程度、輸出控制能力以及色域空間大小。結果顯示濃度較淡的2個白墨階調的透射式圖像（即ICC_(T25)與ICC_(T50)），圖像的反差效果不足且色彩過於飽和鮮豔，而在75%白墨的透射式圖像（即ICC_(T75)）開始，影像的階調、反差、飽和度、膚色以及中性色表現皆良好，而反射式的色域空間雖較小，卻己接近印刷ISO 15339的CRPC6標準，在透射式LED燈片下的視覺觀察發現，在75%白墨與透射式彩色的ICC profile（ICC_(T75)）擁有較接近標準圖像的色彩階調與飽和度。在75%白墨與透射式彩色ICC profile（ICC_(T75)）開始得到較佳的色彩品質，所能複製的Pantone Formula Guide 4.0 Coated色票的數量也達到最高數值，由此可知，底層「彩白」的ICC_(T75)色彩描述檔加上表層的「彩」的ICC_R是綜合「白墨遮蔽」與「底層彩色透射」的最佳化組合。在除去ICC_(T25)與ICC_(T50)的數據後進行分析，結果顯示不同階調白墨與彩色組合UV輸出的ICC profile對於廣告燈箱色彩準確性有顯著影響；不同階調白墨與彩色組合UV輸出的ICC Profile對於廣告燈箱色彩輸出能力「有顯著」影響；以及不同階調白墨與彩色組合UV輸出的ICC Profile對於廣告燈箱色域空間大小「有顯著」影響。總而言之，本研究證明廣告業在執行彩白彩戶外廣告燈箱輸出時的色彩管理可以採用先落實表層反射稿ICC profile的建立，底層透射式輸出搭配飽和度高的白墨與彩色ICC profile的組合，由二個色彩描述檔共同維持反射式與透射式的色彩品質。 |
| 英文摘要 |
The color quality of an outdoor advertising light box is difficult to handle, due to the outdoor illuminant is unpredictable and the advertising light box itself is both a reflective and transmissive types of color device. Moreover the light source of any advertising light box is diverse. Especially, during the night time, the light box generates colors through three layers of media, 4-Color Process, white, and 4 color print layers. To control the color quality of light box becomes an important issue. The purpose of this research was to analyze the relationship of various UV inkjet printer ICC profiles with color accuracy, color controllability, and color gamut. The PANTONE Formula Guide 4.0 Coated Guide was adopted as a color evaluation tools to analyze those UV inkjet ICC profiles. The research defined that the numbers of color swatches of the PANTONE Formula Guide 4.0 Coated Guide by an ICC profile under the condition of ΔE_(00) ≦ 1 is related to the 'Color Accuracy', the numbers of color swatches of the PANTONE Formula Guide 4.0 Coated Guide by an ICC profile under the condition of ΔE_(00) ≦ 2 is related to the 'Color Controllability', and the numbers of color swatches of the PANTONE Formula Guide 4.0 Coated Guide by an ICC profile under the condition of ΔE_(00) ≦ 3 is related to the 'Color Gamut'. A quasi-experiment was used in the research, and the independent variables were different gradient of UV white-ink plus color combination output ICC profiles, and the dependent variables were the color accuracy, color controllability, and color gamut. The results showed that two ICC profiles (ICC_(T25) and ICC_(T50)) among them, generated two unsatisfied color quality (low control saturation and contrast). The ICC_(T75) demonstrated an excellent performance in the aspects of smooth gradient, sufficient color control and saturation, and neutral gray balance. Although, the reflective ICCR created a smaller color gamut, but achieved the standard of CRPC6, ISO 15339. Meanwhile, from the ICC_(T75) to ICC_(T200) demonstrated a significant negative correlation to the color accuracy, color controllability, and color gamut. Furthermore, the ICC_(T75) reached the peak of the numbers of PANTONE Formula Guide 4.0 Coated Guide swatches, which means the ICC_(T75) was the most appropriated output ICC profiles combined with the reflective ICC_R and demonstrated a fine color quality, which was color accuracy, color controllability, and color gamut. |
| 主题分类 |
工程學 >
工程學總論 社會科學 > 傳播學 |
| 参考文献 |
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