I think the answer is related to 'I haven't set any borders that I know of'
Ray, Glenn
There are two places in Qimage that are the keys to solving the printing size problem.
The View Print queue which tells you the size of the print that is being sent to the driver, and the printabale area of the page above the preview panel.
The queue tells you what size the prints will be and even mentions if you have borders turned on.
The printable area above the preview panel on the top right will tell you if you have MARGINS turned on provided you know the printable area of the page you defined.
I have a 9800 driver here which is close enough to a 7800 to work with.
Setting the User defined page to 24.02 x 10.75. selecting roll paper,
banner mode. Printable area is showing as 10.750 x 23.786.
Banner mode give more printable area space.
I set custom print size in Qimage to 10.50 x 20.50 and I have my crop scissor button on in Qimage. My placement setting is Optimal Spaced.
I add my image to the queue.
My print in the view print queue is showing 10.50 x 20.50 as the print size that will be sent to the printer.
(Previously I reminded you to set the printer options in EDIT to RAW, so that is OK.)
Let's go from here.
See if your numbers match mine.
Fred