The black borders will not appear when projected in most presentation environments. Most newer presentation software gives you a Slide selection for paper size, in most cases this is the proper choice, however if you software doesn't give you this option try selecting A4 paper or use a custom paper size of 11x7.33 inches. This is usually no problem because the default color of paper that you put in a laserprinter is most often white. To correct this problem, make sure your software is actually generating a white background, or to be certain, draw a filled white rectangle that covers the background from corner to corner. Most likely, nothing.
Monitors vary greatly as does their gamma setting.
If you want a more accurate representation of color on your screen, set your monitors gamma to 2.2 and generate some test images. We will then image those files and you can adjust your monitor to approximate what you get. Of course, if you see remarkable differences in color, there could be some problems, please call us. It is virtually impossible for us to modify an output file to correct for a problem. In many situations it is impossible for us to preview the file before it is imaged due to the volume of work that we current produce.