A raster graphic is a grid of coloured dots. Photographs are raster images, and enlarging one makes the individual dots visible.
The photo of your pattern is a raster image, the export is a vector graphic. That conversion is what digitizing actually is.

Digitize sewing patterns without tracing.
Test PatternScan Pro free for 14 days with the full feature set. You need your smartphone, a printer and one pattern you always wanted digital.