I stacked 10 images in Xerene Stacker and the output image was tiff at 64 mg; very sharp in focus and detail. To send it with Dropbox, I had to reduce it to under 50 mg, so using Lightroom 6, I exported it reducing the pixels on each side from the cropped 3351 to 2700, keeping ppi at 300 and keeping it in tiff format. This still kept the image at about 40 mg. I was shocked when the resulting image was soft as mush, with great loss of detail and sharpness. What happened? Any help will be appreciated.