This allowed the creation of a number of different versions of, for example, an advertisement, by adding, exchanging and removing layers. Later, in commercial art and in animation, a stack of transparent sheets was used to build up a composite image with parts of the image on each layer. The early masters of oil painting learned how to use several layers of transparent paint applied over an opaque white base to create dazzling effects of light, shade and colour. The technique of using layers in art goes back a long way. We'll also briefly examine some iPad drawing apps. Part two (coming in September) looks at Adobe Illustrator and two simpler desktop applications - Microsoft's Visio and LibreOffice Draw. Part one of this article looks at the history and background of vector image creation and examines Inkscape, an open-source application, and CorelDRAW, a proprietary program. As a result, highly detailed vector images can take a long time to render and redraw. The advantage of vector images are that they scale well and have an efficient memory footprint, although they are also processor-intensive.
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