No idea about Paintshop but as a workflow:
1) load your image
2) shift the canvas 30% right + 30%down
3) grab your cloner brush and start painting away the seams
4) repeat steps 2 and 3 if nescessary
5) done
The programs that are made for this purpose use several algorythms that produce quite good results but in the end the maximum quality will only be achieved by doing this manually.
Especially for realtime work every pixel is of value so blurring/distorting images by using one-click solutions will degrade the overall quality of your graphics.
1) load your image
2) shift the canvas 30% right + 30%down
3) grab your cloner brush and start painting away the seams
4) repeat steps 2 and 3 if nescessary
5) done
The programs that are made for this purpose use several algorythms that produce quite good results but in the end the maximum quality will only be achieved by doing this manually.
Especially for realtime work every pixel is of value so blurring/distorting images by using one-click solutions will degrade the overall quality of your graphics.