Question

how is image more reliable than a shadow​

Answer 1

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$ANSWER$ => An image is more reliable that ashadow in that an image is present with any kind of lighting while a well defined shadow is only present with directional lighting.

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Answer 2

An image is more reliable that a shadow in that an image is present with any kind of lighting while a well defined shadow is only present with directional lighting. An image also provides far more information.