Since, Isabelle just purchased a camera with an 18-MP image sensor, the number of pixels that her camera can capture and process is 18 million pixels.
In regards to picture and photography, the more pixels, the higher the detail as well as the sharpness of the image that is display or shown.
Note that the Resolution is seen as the measurement of image sharpness and the fact is that it is one that can be expressed in millions of pixels, as well as in megapixels.
Therefore, Since, Isabelle just purchased a camera with an 18-MP image sensor, the number of pixels that her camera can capture and process is 18 million pixels.
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