The ImageType describes the type of an Image. It is a
JSON object with the following attributes:

dimension: An integer that describes the dimension for the image, typically 2 or 3.
pixelType: The PixelType. For example, Scalar, Vector, CovariantVector, or SymmetricSecondRankTensor.
componentType: The type of the components in a pixel. This is one of the IntTypes or FloatTypes.
components: The number of components in a pixel. For a Scalar pixelType, this will be 1.