Improve the way the new canvas size is calculated
If both dimensions are given, always use those dimensions, avoiding roundoff error. If only one dimension is given, slightly prefer rounding the other dimension up, to rounding it down.
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@ -64,7 +64,7 @@ func Resize(width, height uint, img image.Image, interp InterpolationFunction) i
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scaleX, scaleY := calcFactors(width, height, oldWidth, oldHeight)
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t := Trans2{scaleX, 0, float32(oldBounds.Min.X), 0, scaleY, float32(oldBounds.Min.Y)}
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resizedImg := image.NewRGBA64(image.Rect(0, 0, int(oldWidth/scaleX), int(oldHeight/scaleY)))
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resizedImg := image.NewRGBA64(image.Rect(0, 0, int(0.7+oldWidth/scaleX), int(0.7+oldHeight/scaleY)))
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b := resizedImg.Bounds()
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n := numJobs(b.Dy())
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