Your camera might think the scene is too bright and darken it, making snow look gray. Dial in positive EC (+1.0 to +2.0) to keep the whites white.
EC works in semi-automatic modes like , Shutter Priority (S/Tv) , or Program (P) . EC - Outdoor Exposure.mp4
Use the histogram on your screen to ensure your highlights aren't "clipping" (touching the far right edge), which means you're losing detail in the brightest areas. Your camera might think the scene is too