The goal of SpyderGallery is display an image, viewed at an appropriate brightness level for the current lighting, in most any situation, in a manner that will be perceptually similar to what a calibrated display under a controlled lighting condition would show. That is not the same as an absolute side-by-side comparison, where precise matching of whitepoint, luminance, and display gamut are used to attempt to create visually identical results under a single condition.