XFORCE released OS X version BenVista PhotoZoom Pro 6.0.2. I know this on best on PC platform, not sure for Mac, let me know in comments.
PhotoZoom Pro 6 not only creates larger images than any other software (up to 1 million by 1 million pixels), it also produces higher quality results. PhotoZoom Pro 6 is equipped with S-Spline Max, a unique, patented image resize technology which excels at preserving clean edges, sharpness, and fine details.
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