It is often necessary to batch convert PDF documents and graphics into other formats. The SnagIt Batch Image Converter allows you to apply a number of filters and image modifications to a group of photos, pictures or graphics and then save. The SnagIt Batch Image Converter comes free with your registered copy of SnagIt screen capture software, and if you haven’t been using it, you’re missing out on an excellent graphic app.This involves rasterisation, and so does degrade quality, but I use a high “dots-per-inch” (DPI) when plotting, so that quality is maintained. Even Microsoft’s own software on Mac OS X does not support WMF files properly, and often has difficulty importing documents using this format.In an ideal world, Microsoft Powerpoint would support PDF graphics easily, but until it does, one needs to convert the files manually.The best way at present appears to be to convert them to high-quality bitmap images. Unfortunately, the standard vector file format for Microsoft applications is WMF (Windows Metafile), a proprietary and poorly documented standard, which means it is poorly supported by other operating systems, like Mac OS X and Linux. This makes things very difficult, and while I prefer to use Apple’s Keynote program, presenting at scientific meetings tends to require Powerpoint.Vector graphics are different to bitmap graphics, and tend to be smaller, and scale to both small and large sizes without becoming “jaggy”. PDF is a great format, fully supported on the Mac, but Microsoft Word and Microsoft Powerpoint do not support PDF properly. My semi-automated system for generating these using complex R scripts to fetch the latest data from PostgreSQL, perform analysis, and then generates PDF and Postscript files for inclusion into LaTeX documents.
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