This is an excerpt from Alamys site on upsizing
"We strongly recommend that images are captured on a digital camera capable of producing files of 17MB and upwards (6 megapixels). Please then interpolate the images to a minimum of 48MB using professional upsizing software.
We recommend Genuine Fractals™, although other professional upsizing software is equally acceptable, including Abobe Photoshop versions 7 and CS/CS2 (if the bicubic option is used). "
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