碩士 / 國立雲林科技大學 / 視覺傳達設計系碩士班 / 91 / Technology brings us more convenient life. For instance, the inventions of digital cameras can serves as a took-it-and-saw-it machine, and a great performance on image preservation. It is predicted that the coming years are full of digital products, an era of digital images. In this research we tried to examine the best color performance of digital images by a series of experiments with experts who have enough experiences on color adjustment because the quality of digital images counted on people’s color preference.
Experimentation is used in this study as a research method. First we invented the examinees to adjust the selected digital images performed on Barco monitor in the dark room. After their adjustment to the digital images, we used Spetra Scan PR650 to further examine each image. According to the information from PR650, we can further discuss the differences among human-adjust model, original model and Auto Levels model to get the following results:
(1) The contrast of color lightness and contrast between each color field are two primary issues in expert-adjust model.
(2) The examinees tended to elevate the lightness of digital images, especially in the case of mid-lightness images. The result of the adjustment is like a parabolic relationship between the hand-adjust model and the original model. But in the case of Auto Levels adjustment (a particular function in PhotoShop), it tends to elevate the lightness of digital images just according to the lightness of original images. The result performs like a linear relationship.
(3) The examinees tended to make the blue color look like green in pictures took under sun light. Color yellow should be orange and color orange should be magenta in pictures took under light bulbs. But in the case of Auto Levels adjustment, it tends to make color blue look like purple in pictures took under sun light. Color yellow should be green and color orange should be yellow in pictures took under light bulbs.
(4) The examinees tended to elevate the lightness to CIELAB △L*=5.5 in pictures took under an overcast sky; CIELAB △L*=5 in pictures took under cloudy days; CIELAB △L*=3 in pictures took under sunny days. If it comes to be pictures took under bulbs or daylight lamps, examinees tended to elevate the lightness to CIELAB △L*=3 without flash light; CIELAB △L*=7.5 with flash light.
(5) If we elevate the saturation of the pictures under sunlight, bulbs and daylight lamps, we can get digital images with higher quality.
| Identifer | oai:union.ndltd.org:TW/091YUNT5634052 |
| Date | January 2003 |
| Creators | Shao-hung Ni, 倪韶鴻 |
| Contributors | none, 管倖生 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 160 |
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