Browsing by Author "Brennecke, Angela"
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- ItemOpen AccessBeyond Pixels: Illustration with Vector Graphics(2006-02-14) Isenberg, Tobias; Brennecke, Angela; Costa Sousa, Mario; Carpendale, SheelaghThis report presents a novel vector rendering pipeline that allows us to easily break the pixel barrier and create high-quality illustrations. Recently, most graphic research has been directed towards rendering pixel images that appear realistic. In contrast, we investigate the generation of vector graphic illustrations using non-photorealistic techniques such as line rendering and Gooch shading. By combining vector output from both shading and line rendering of 3D models we create high-quality illustrations that can directly be used in print reproduction. Our approach uses a vector graphic pipeline that tracks multiple attributes of strokes and uses them for stylization. This allows to have multiple layers of line rendering such as different stroke types or visible and hidden parts of strokes, each treated differently according to specific stylization rules. Using high quality vector graphics (as opposed to pixel renditions) for representing illustration is essential, in particular, in the print reproduction process. Foremost, vector graphics can be reproduced at any desired resolution; they do not suffer from the resolution dependence of pixel images. In addition, only vector graphics can capture fine details accurately while maintaining a reasonable file size. Finally, vector graphics do not need to be half-toned when printed as long as spot colors are used. Even if some layers of the image use, e. g., shading, only those parts of the vector graphic need to be half-toned that actually do not make use of the available spot colors. Thus, we can combine both shading and line layers without compromising print quality.
- ItemOpen AccessG-Strokes: A Concept for Simplifying Line Stylization(2005) Isenberg, Tobias; Brennecke, AngelaIn previous systems, only very few line properties have been used for stylization in line rendering. This is due to a complicated handling and two-way dependency of these properties and the stages of the stylization pipeline. In this paper we propose the concept of G-strokes to efficiently deal with these and many more stroke properties. This new concept allows a much simpler way of representing and handling various line properties and stylization stages. By this we make it easy to enrich the set of line stylization means by adding more properties and stylization stages and, thus, allowing more freedom and creativity for generating expressive line drawings. We show a number of possible G-strokes using both simple and complex examples to demonstrate the power of our approach.