how to create action for photo frame?

[chemoul]

Hi,
I would like to automate the creation of a frame with top rounded corners around images as shown in the image below. The rounded corners should always be the same size and angle no matter the size of the picture.
I'm having problems creating and recording a suitable photoshop action that would work for any picture dimension and that won't resize the top rounded corners.
Any ideas?

Thank you.
Steve

 

[ljiljana]

Hi Steve,
Try to use procentage for image size.