When displaying a georeferenced raster image in ArcMap that has a lot of line art, the lines are diminished to dashed lines due to the on-the-fly compression algorithms that are built in to the application.

Case in point:  Here is the original close up view of the georeferenced TIF image in photoshop:

Screen Shot 2013-11-25 at 11.36.49 AM

 

As you can see, the tif image has been georeferenced with just 2 control points, rotated slightly, and scaled appropriately.  A close up look (still in photoshop) reveals the line quality maintained:

 

Screen Shot 2013-11-25 at 11.42.40 AM

However, when the geotiff is then imported into ArcMap, the lines become dotted lines!  This is regardless of what compression is set.  Here are 3 resampled examples published to ArcGIS Server (click to interact):

Screen Shot 2013-11-25 at 11.43.28 AM

RGB Cubic

Screen Shot 2013-11-25 at 11.44.09 AM

RGB Majority

Screen Shot 2013-11-25 at 11.44.46 AM

RGB Nearest Neighbor

All 3 samples above were published as Image Services, changing the parameters to see if they made any differences.  For all of them

I will be asking ESRI if they have a solution to this problem.  If anybody has any suggestions, please post a comment below.