Important Tip: If you flatten the image before printing, it will shrink the file size significantly and increase your chances of success in plotting. For example, the Photoshop dimensions might be 32 inches wide by 20 inches high. 
If the longer side of your image is less than 35 inches, you will use the smallest amount of paper if you orient the image such that it looks ‘landscape’ on the screen. For example, the Photoshop dimensions might be 30 inches wide by 44 inches high. If the longer side of your image is more than 35 inches, you will need to orient the image such that it looks ‘portrait’ on the screen. Tip: No matter how you orient the image, you will often need to select a custom page size when printing. To switch the orientation of the image, use the “Image” menu to rotate the entire image by 90 degrees. Depending upon the dimensions, you may need to rotate the image before printing. Next, orient the image appropriately within Photoshop, as described below. Larger resolutions result in huge files that almost always have trouble plotting. Verify the image resolution: it should not be larger than 300 DPI (dots per inch). You may need to zoom out to see the entire image on the screen. Take note of the image height and width (in inches). From the “Image” menu, select “Image Size”. Determine the dimensions and resolution of your image (so that you can later select the correct paper size). Procedures Preparing the Image for Plotting: 
This document provides you with a quick overview of how to plot to DotCIO's plotters using the Windows version of Adobe Photoshop.
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