Make sharp dashed line path stroke on rounded corners in Photoshop?

Following this answer, I've tried to make rounded corners with dashed stroke, but the output is blurry. Is there any method to make a sharp dashed stroke in Photoshop?

Answer

Since you have access to Illustrator, the easiest way to do a dashed stroke is to create the stroked shape in Illustrator and copy/paste it into Photoshop.

Since you're unfamiliar with AI, here's a quick step-by-step:

1. 
   

   Use the Rectangle Tool (M) to create your shape:
   
   

   
   


2. 
   

   With your shape selected, Effect ⇒ Stylize ⇒ Round Corners...
   

   
   


3. 
   
   

   With your shape still selected, Open your Stroke palette and set the Dashed Line attributes to your liking.
   

   
   


4. 
   

   You now have a shape with a dashed stroke. Copy it and paste into Photoshop. If Photoshop asks how you want to paste, choose "as pixels".
   

   
   

Note on above: Illustrator's display will likely anti-alias your shape. If you screengrab and then paste into Photoshop, you will still have "blurry" problems. If you copy and paste the object itself, you will not have this issue. You should also keep your shape dimensions in whole-pixel increments to avoid Photoshop anti-aliasing when it pastes the pixels.