what is best file extension for photo montage?

[Clive Round-Turner]

Can you experts help me?
I want to create a matrix of sunsets in a format to ultimate have printed on see-through Perspex table mats or as a back-lit wall display. What file format do you recommend? The 20 photos are not overlaid, but simply laid out in five columns. However, it will take time to complete the montage, so as I need to return to the template and be able to see the guidelines and rulers. Your guidance would be appreciated on what file extension and Paint Shop Pro settings are recommended. Thanks.

 

[USAFRet]

Can you experts help me?
I want to create a matrix of sunsets in a format to ultimate have printed on see-through Perspex table mats or as a back-lit wall display. What file format do you recommend? The 20 photos are not overlaid, but simply laid out in five columns. However, it will take time to complete the montage, so as I need to return to the template and be able to see the guidelines and rulers. Your guidance would be appreciated on what file extension and Paint Shop Pro settings are recommended. Thanks.

While you're building this, leave it in the default PSP file type.
When you send it off for printing, whatever filetype they want.