In order to provide prototyping templates, I would like to create a smartphone, tablet, and notebook template as raster graphics. There are many tutorials on YouTube which, unfortunately, start with what I would like to have as a result, for example How to create an iPhone X Mockup.
Do you know of a tutorial to create “empty” frames of devices in the first place?
Photoshop is not a must-have-requirement. Inkscape or any other open software would be even more welcome.