Your light metre LIES to you. Your light meter will only give a “correct” reading for MEDIUM TONES ie middle blues, reds, greens, yellows, greys etc. If you meter DARK TONES your metre will suggest settings that will result in a LIGHTER TONE in the final photograph ie a black cat will come out “greyish”.
In the same way, if you metre LIGHT TONES your meter will suggest settings that will result in a DARKER tone in the final photograph ie white snower will come out “greyish”.
In both these cases you will need to compensate by under-overexposing in the case of the black cat (this will render the cat really black) and over-exposing in the case of snow (this will render the snow white).
This is the same no matter how expensive your camera. This is one of the reasons you will frequently get badly exposed shots when using the automatic mode on your camera.
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