Hi Guys and Dolls
What I wanted to do. I have a frame with a pre-cut matt. I wanted the image to be inside the matt with a 1 cm border and a black stroke around the image.
What I did in Affinity Photo. Created a new document at the size of the Matt aperture. Filled with white. With my image open on another tab flattened it, right clicked to copy it.
I went back to the new white background image, clicked on the background layer and right clicked to paste my image.
I then selected my newly pasted image layer, and with the move tool repositioned it on the background leaving a border. From top menu selected arrange - align middle.
With the image layer selected go to layer effects outline and select a radius. Looks OK and is now hanging on my wall