The last one was 24x96 inches and another one is 24x135 inches. Any upsampling is usually done in Photoshop CC although I have use Genuine Fractals.  Can usually only save as PSB files due to their size.
I really like the output sharpening of Qimage and would like to be able to use the program for the output of the files.

Started printing a large panorama saved as PSB file with a size of 4 Gb but getting a Read Error message.
What is the largest file size that QImage Ultimate can handle?