Materials, Visualization, Rendering - Autodesk Revit Architecture 2015 Essentials - page 219

Click the Print radio button. When switching to print output, you can
specify the DPI. The higher the DPI, the longer the rendering takes.
To have crisp edges in your finished rendering, set DPI to 150 .
7. Once this rendering finishes (Figure 9.13), click the Save To Project
button. This will prompt you to name the image. The image will be
saved in your Project Browser under the Renderings branch. You can
also click the Export button, which will save your rendering to your
computer's hard drive as a .bmp , .jpg , .png , or .tif file.
Figure 9.13 The finished rendering
You can continue to test different rendering quality settings and
background options. Rendering is an iterative process; working from
low quality toward high DPI is a fast way to reach a finished image.
If you want to select a wall or change a material, you can click the
Show The Model button at the bottom of the dialog to switch from a
static rendered image back to the model.
This concludes Exercise 9.6. You can compare your results with the sample
file c09-ex-09.6end.rvt in the downloaded files for this chapter.