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Chapter 6. Rendering

Chapter 6. Rendering

The Adobe imaging model separates graphics (the specification of shapes and colors) from rendering (controlling a raster output device). Figures 4.12 and 4.13 on pages 208 and 209 illustrate this division. Chapter 4 describes the facilities for specifying the appearance of pages in a device-independent way. This chapter describes the facilities for controlling how shapes and colors are rendered on the raster output device. All of the facilities discussed here depend on the specific characteristics of the output device. PDF documents that are intended to be device-independent should limit themselves to the general graphics facilities described in Chapter 4.

Nearly all of the rendering facilities that are under the control of a PDF document pertain to the reproduction of color. Colors are rendered by a multiple-step process outlined below. (Depending on the current color space and on the characteristics of the device, it is not always necessary to perform every step.)


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