There will be a considerable amount of averaging and re sampling before the final resize. Depending on shape of the region and how samples outside it are handl

There will be a considerable amount of averaging and re sampling before the final resize. Depending on shape of the region and how samples outside it are handled you may see considerable variation in the results. What I would be interested in is how much the colour would differ if another colour space were used. I wouldn’t expect a huge change in the imital re projection as adjacent samples are likely to be close in whatever colour space is used, but I think it might change some of the average colours.