import pydicom

def window_image(img, window_center,window_width, intercept, slope):

    img = (img*slope +intercept)

    img_min = window_center - window_width//2

    img_max = window_center + window_width//2

    img[img<img_min] = img_min

    img[img>img_max] = img_max

    return img 

def get_first_of_dicom_field_as_int(x):

    #get x[0] as in int is x is a 'pydicom.multival.MultiValue', otherwise get int(x)

    if type(x) == pydicom.multival.MultiValue:

        return int(x[0])

    else:

        return int(x)

def get_windowing(data):

    dicom_fields = [data[('0028','1050')].value, #window center

                    data[('0028','1051')].value, #window width

                    data[('0028','1052')].value, #intercept

                    data[('0028','1053')].value] #slope

    return [get_first_of_dicom_field_as_int(x) for x in dicom_fields]