As long as it is possible to convert the images from the format originally used to a format that another DVI driver understands, document portability can be achieved. On the bright side, most DVI drivers provide some mechanism for incorporating pictures and figures. If document portability is an issue, consider carefully before you select a particular way of including pictures and figures. TeX's notion of a picture is frequently nothing more than “something special goes here (I don't know what) and it's 5 inches wide, 2 inches high, and 1 inch deep.” This is device independence, of a sort, but many of the easiest ways to include pictures and figures in TeX do rely on features of a specific DVI driver or a specific kind of printer. Remember, TeX cares only about building pages out of boxes and glue. Pictures and figures are a foreign concept to TeX. High-end graphic packages like \product$ of an inch wide.” Device Independence Revisited Some bitmap images can be converted into scalable formats. Scanners always produce bitmapped images. Photographs and images with a lot of subtle detail are almost always stored as bitmaps. If you want to know more, refer to the filename extension glossary in Appendix A, which will help you identify each of the formats discussed in this chapter. If your DVI driver understands PCX images, you just need a PCX image you don't have to have a detailed understanding of the format (thank goodness). I do this partly because it is easy, but also because it is the most common way of referring to them, and you don't really need to know anything about the image formats to use them. In this chapter, I refer to graphic image formats by their extension (for example, GIF images or XBM images) without explanation. The extension is a common and convenient nickname for the image format. Both classes have advantages and disadvantages.įiles that contain graphic images usually end with an extension that identifies the format of the image. Scalable images are produced by some more sophisticated drawing programs, many commercial sources, and some other applications. They are also produced by most simple paint programs. Bitmapped images are produced whenever an image is scanned from a drawing, photograph, or other printed work. Images come from many, many different sources, but they can be divided into two broad classes: bitmapped and scalable (or vector). The most important considerations are the type of image, the type of printer you will be using, what platform you are using, and how portable the document must be. There are many ways to include pictures and figures in TeX. This chapter explores how they can be incorporated into your TeX documents. Pictures and figures are an important component of many documents.
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