I suspect you have at least 2 problems, one is playback and graphics card settings for overlay proc amp and settings in various playback software; the other is colorspace and vegas behavior.
There are so many factors and multiple points of failure where the viewing experience can change and not be consistent. You have no control over how the end user has their setup managed.
I think Vegas' display uses GDI , so to get that to correlate with a certain software, you would have to calibrate both the desktop and overlay settings in the video card, as well as the monitor. It has to be calibrated to a greyscale image or video. Note: This will throw off your regular display, since most PC's display at 0-255 (white is mapped to 0, black is mapped to 255). Hence why many people make the use of an external reference monitor that displays 16-235 if it's intended for "legal" video range targets (e.g. blu-ray, DVD.)
There are so many factors and multiple points of failure where the viewing experience can change and not be consistent. You have no control over how the end user has their setup managed.
I think Vegas' display uses GDI , so to get that to correlate with a certain software, you would have to calibrate both the desktop and overlay settings in the video card, as well as the monitor. It has to be calibrated to a greyscale image or video. Note: This will throw off your regular display, since most PC's display at 0-255 (white is mapped to 0, black is mapped to 255). Hence why many people make the use of an external reference monitor that displays 16-235 if it's intended for "legal" video range targets (e.g. blu-ray, DVD.)