Get images for expressions
        Args:
            body, ExpressionOperation: The JSON encoded expression to be evaluated (required)
            imageScalar, int: The scale of the image (optional)
            plotShape, str: The image shape (optional)
            imageEncoding, str: The encoding of the returned image (optional)
            sparsity, float: Sparsify the resulting expression to this percentage (optional)
        Returns:
            str with the raw byte data of the image
        Raises:
            CorticalioException: if the request was not successful

def getImage(self, body, imageScalar=2, plotShape="circle", imageEncoding="base64/png", sparsity=1.0):
        """Get images for expressions
        Args:
            body, ExpressionOperation: The JSON encoded expression to be evaluated (required)
            imageScalar, int: The scale of the image (optional)
            plotShape, str: The image shape (optional)
            imageEncoding, str: The encoding of the returned image (optional)
            sparsity, float: Sparsify the resulting expression to this percentage (optional)
        Returns:
            str with the raw byte data of the image
        Raises:
            CorticalioException: if the request was not successful
        """
        return self._image.getImageForExpression(self._retina, body, imageScalar, plotShape, imageEncoding, sparsity)