The Cairo package is based upon libraries undergoing continued development and maintenance, unlike the GDD package. If you use Cairo or GDD, your admin will need to install an additional graphics package. If you are working on a headless server without an installed display buffer, you will need to use Cairo(), GDD() or bitmap(). There are currently three choices for doing so: Cairo(), GDD() and bitmap(). Ask your admin to install a display buffer on the server such that it can access the appropriate device drivers.If png() and jpeg() Don't Work, What Are My Options?. These are unavailable when R is installed on a "headless" Unix server. Why Don't png() and jpeg() Work? On Unix, jpeg() and png() rely on the x11() device drivers. If you do not receive warnings, you can ignore the rest of this section. If this script outputs both warnings, you’ll need to avoid both jpeg() and png() functions. Warning( "You cannot use the png() function on your LabKey Server") If(!capabilities(what = "png") || !capabilities(what= "X11")) Warning( "You cannot use the jpeg() function on your LabKey Server") If(!capabilities(what = "jpeg") || !capabilities(what= "X11"))
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