Why are the photos taken by my digital camera always gray, like cloudy days?

"Gray" is a bit vague, try to analyze it.

1

White balance setting problem. If this "gray" is cold, that is, it tends to be blue and gray, then it is probably a higher value setting in white balance manual mode. But if this is the case, the color of the film taken on cloudy days should be normal than that taken on sunny days.

2

This is the case with films with a large proportion of sky area. Then, because the automatic exposure mode is used, the exposure of the whole picture is automatically reduced because the sky brightens and interferes with photometry. But if that's the case, movies that don't contain a large sky should be normal.

three

Climate and environment. I wonder what the climate is like in your city. If there are many cloudy days, the light ratio is small; The pollution is heavy, the outdoor visibility is low, the contrast of the scenery is naturally small, and the graying is normal. But if that's the case, it should be normal to shoot at close range indoors.

four

All films are underexposed as a whole. Look at the setting of increasing or decreasing exposure, and make sure it is set in negative gear, that is, decreasing exposure.