GIMP: I want my printed image to fill a entire page
 

[Never mind, I solved my own problem. Sorry.]

And how did you resolve it? I use gimp, and would be interested in knowing.

Cheers,

Right, I was waiting for someone to ask. Image--->Print Size. The default measurement is inches. I didn't know what numbers I should enter, so I experimentally entered 50 for width, and GIMP automatically entered 37.500 for height. The result was not perfect, but close: my printer printed an image that would have filled the page except that the positioning was about half an inch too far to the left, cutting off some of the image. I haven't learned how to fix that yet. (It shouldn't have anything to do with the width and height I entered, any more than you can fix the horizontal positioning on an old-fashioned monitor by changing the horizontal size.)