紅外線浮水印於數位印刷品之應用—以陳澄波〈嘉義公園一景〉為例

Abstract

隨著藝術與科技整合的年代來臨，透過現代科技不僅可以將藝術融入生活，也探索出藝術品更多價值及隱含之深層意義；隨著消費行為的改變，產品的獨特性亦日漸受到消費者重視。本研究以重現〈嘉義公園一景〉畫作在X光線下出呈現底層〈雙裸女圖〉為概念，製作加值明信片，除了具有獨特性外，更具防偽功能及收藏性。本研究採用實驗研究法，首先利用陳澄波〈嘉義公園一景〉油畫作品之圖像，運用各色墨於紅外線下不同之光學特性，黑色墨會因為吸收紅外線而顯現，而青、洋紅、黃色墨在紅外線光源下呈現透明之特性，將黑色墨網點與不同濃度的青、洋紅、黃色墨網點，經過數位過網所形成的中性灰進行匹配測試，找出人眼觀看下最符合灰平衡的各色墨濃度參數，爾後將〈雙裸女圖〉製作成紅外線浮水印圖像嵌入於〈嘉義公園一景〉中，以數位印刷機輸出成明信片，最後利用紅外線偵測裝置進行驗證。實驗結果顯示，人眼僅能觀看到〈嘉義公園一景〉之圖像；經由紅外線偵測裝置偵測下，具碳黑色墨的〈雙裸女圖〉之隱藏背景資訊顯現。本研究成功製作出具有紅外線浮水印之加值明信片，確實可達到增進產品的獨特性與防偽加值之應用。With the era of the integration of art and technology approaching, through modern technology, not only art can be integrated into life, but also can explore more, the value of the art work and their hidden meaning; as consumers’ behaviors change, the uniqueness of products are increasingly valued by the consumers. The research is on “A Scene at Chiayi Park”, by using X–ray, “double naked female figures” appear beneath the painting. With this concept, a value-added postcard is created. In addition to being unique, it has security features and will be welcomed as a collection. The experimental method is adopted in this research; first, by using the oil painting of Chen Cheng-po, ” A Scene at Chiayi Park”, and infrared absorption of carbon black ink, while the cyan, magenta, yellow ink infrared through the optical properties. Through digital halftoning technique, the matching of the black ink and the different color concentrations of cyan, magenta and yellow ink formed neutral gray. Using the test guide in a systematic way, to find out the best matching parameters of hidden infrared watermarking, combined with infrared optical properties “the double naked female figures” will be produced in an infrared watermarking image embedded in the oil painting of “A Scene at Chiayi Park”. Through digital printing machine, postcards are printed. Finally, the infrared detection device is used for verification. The result of the experiment is that , our human eyes can only see the image of ”A Scene at Chiayi Park”; but after using the infrared detection device, the hidden naked women with carbon black ink are displayed. This research has succeeded in producing the valued-added postcard with the effect of changing graphs. Indeed this can enhance the uniqueness of the products and can offer the application of anti-counterfeiting value.