If you could tell us which printer you intend to use the reply can be more affirmative.
If the printer knows a banner mode then the method described in the Qimage Learn by Example 6a manual text is the route to go.
Make 100% quality JPEGs, the white spaces in gen trees will shrink the image files enough for this kind of jobs. If that is not enough you can even stitch images lengthwise on the Qimage print page. Roll length is the limit in the end I guess.
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Met vriendelijke groet, Ernst
http://www.pigment-print.com/spectralplots/spectrumviz_1.htmJuly 2013, 500+ inkjet media white spectral plots.