RGB colors will closely match what you see on the Prism screen (which internally uses RGB). We recommend that you choose RGB when possible, as there will be fewer surprises. If you choose the PDF, EPS or TIF format, you'll need to choose between RGB and CMYK color models. If you double the dpi, note that you quadruple the number of pixels in the image, and thus quadruple the file size. The other formats offer choices of 100, 300, 600, and 1200 dpi. If you export in one of these formats, you will not be asked to enter a resolution. The PDF, EPS, WMF (Windows only) and EMF (Windows only) formats encode vectors and fonts, so have essentially infinite resolution. Laser printers range from 300 to 1200 dpi. For perspective, most computer screens have a resolution of about 100 dpi, and most professional printing presses (used by journals) use a resolution of 1200 dpi.
The resolution is entered in dots per inch (dpi). JPG, and BMP formats simply have no concept of a clear background, so those file formats simply don't allow for the possibility of clear backgrounds. If you choose to export as a TIF file with a clear background from Prism Windows, it will be RGB 32 bits (with no choice of color model). With Prism Mac, but not Prism Windows, you can choose a clear background with EPS export. The TIF, PNG, PDF, WMF (Windows only) and EMF (Windows only) formats allow you to choose a transparent (clear) background. If the background is clear, you'll see other objects that are behind it. When you paste or export a Prism graph into another program, however, the two are distinct if the exported graph is combined with other objects that are behind (in a front-to-back sense) it. Within Prism, there is no distinction between having a clear page background and a white background.
Read about the pros and cons of the alternative formats. If you don't want to think about it, we suggest using PDF if you can, and use TIFF as a second choice. With PDF format, you can choose to export each to its own file or all to one file.
With most formats, each graph or layout will be exported to its own file. To export several graphs at once, start from the graph gallery, select two or more graphs, and then choose to export. Export one graph or layout, or several or many?
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