Actually, the image dimensions are also relevant. 300dpi at 2" x 1.5" is going to print 2" x 1.5". At 300dpi, it is still difficult to enlarge without either losing clarity or getting pixellation (jaggies). I always render big (300dpi and dimensions), and shrink it later. But beware: a 300 dpi image at, say 5" x 4" (or 8" x 6"), will take a long time to render, depending on your computer's resources, and may even crash smaller systems. Save your work before trying to push your machine beyond where it's gone before.... Also: JPG is a very lossy format. When you're done, save it as a TIFF file (the best flat image format), or take it into Illustrator if you have that and save it as an EPS. (This is extreme print advice -- your needs may be smaller, especially if you're just looking to print from your home ink-jet) If you're trying to print something the dimensions shown above (8.3"w x 6.25"h), then the message you were getting also has to do with the margins that Photoshop wants to print at. It wants to keep a maximum printing area of 8" x 10" so you can shrink the image to 8" wide, print in landscape form, or find a way to reset the margins (I haven't found that, myself).