Hi there I have Macromedia Fireworks and I usually save my work in TIFF format for printing as it's usually the best although, I have been told that 300dpi is best for printing but, if would it make any difference if I set the dpi to 800?

The best place to start for a thorough understanding of resolution is in the output stage. On most scanners, there's a box where you can plug in your planned output resolution. Set this number to 300 dpi. (The designation dpi is slightly deceptive here-it's really pixels per inch, ppi. It's typical now, though, to refer to it as dpi.) There's a simple reason for thisyour printer is optimized to print its best quality color at 300 dpi. When you look at the printer's spec sheet, it may say that it's a 600 dpi printer or an even higher resolution. Don't be fooled into setting your output resolution to 600 dpi, though. Printer resolutions are related to image resolution, but the numbers mean different things. Output resolution is a matter of pixels, and printer resolution is a matter of dots. Your printer's maximum resolution may be 600 dpi, but remember that pixels are bigger than dots. Many dots are set down by the printer to create the physical manifestation of a pixel. Even if you set your output resolution below 300 dpi, your printer, set on highest quality, will still be laying down 600 dpi. Your printer is made to print color at a maximum output resolution of 300 dpi. If you don't believe it, try printing an image at 300 dpi, then something higher, say 450 dpi. You won't see any difference. The printer is maxed out at 300 dpi. Check out some dye-sublimation prints at 300 dpi, and you'll soon see that it's difficult to imagine getting any finer than that. http://www.mkprod.com/ResolvingResolution.htm

Sorry! Been away on holiday! MANY thanks for such a great answer :o)