媒介何为——论投影映射中的“屏幕”问题

What’s the Medium?—On the“Screen”in Image Projection

一般情况下,我们认为投影映射描述了图像和空间的对应关系。在这一关系中,图像指涉映射的内容,即由计算机处理过的虚拟影像;“屏幕”指涉映射的形式,即承载拟像的现实物体表面。过去,我们的研究重点往往落在图像的生成和最终的视觉呈现上,而忽略图像之外“屏幕”的存在。本文将以投影映射中的“屏幕”为线索,通过提取它在历史中的关键变形来分析其背后的逻辑生成。同时,结合具体的艺术作品来帮助分析它在投影映射中具体的表征和意涵,进而阐释“屏幕”是如何成为一种艺术媒介被我们再次看见。

Oftentimes,we hold that image projection characterizes a correspondence between image and space.In this relationship,while the image denotes the content of the projection,the virtual image processed by the computer,the“screen”refers to the form of the projection,the surface that displays the projected image.Previous research has generally focused on the creation and eventual presentation of images but overlooked the presence of the screen that exceeds the image.The essay explores the role of the screen in image projection by tracing its historical transformation and scrutinizing the underlying logic that facilitates the changes.In the meantime,it also examines specific presentations and connotations of selected artworks to explicate how the“screen”is made visible as an art medium.