Hi Todd ,
Kindly accept our sincere apologies for the delay in getting back to you.
To get the clear image of grid in Print preview dialog, you have to set SmoothingMode to AntiAlias and InterpolationMode of graphics object to HighQualityBicubic. Please refer to the following code snippet.
[C#]
Graphics g = Graphics.FromImage(bm);
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
I have attached the sample for your reference.
http://websamples.syncfusion.com/samples/Grid.Windows/F69679_Nov23/main.htmPlease refer to it and let me know if this helps.
Regards,
Nagaraj