A Sharper Scaling is a high quality image scaling technology mainly developed for upscaling. Although A Sharper Scaling does nothing but scaling images, it can also contribute to the quality of other geometric transformations like rotation, perspective correction, or lens distortion correction. Just upscale the image by a factor of x before the transformation and downscale it back by x after that. Whether this has a benefit or not depends on the image editor used and the type of transformation.