just make it smaller
or decrease the DPI (I think standard windows DPI is 96, commercial printing is 150 DPI, and high quality printing is 300 dpi)
or make it a jpeg and turn the compression all the way up
or reduce the color from 32 bit to 16 bit or 8 bit (depending on what colors you used)
You are my obsolete mule. I am broken brilliance.
Aaah Brother Nero, I knew you'd come!