import cv2
import numpy as np
from matplotlib import pyplot as plt

def intensity_hist(image_file):
    """show some descriptive stats of some of the most relevant aspects in the dataset.
    Such as the min, max, median, mean of the image sizes.

    Args:
        image_files: string. Path of image file.
    """
    img = cv2.imread(image_file)

    plt.figure(figsize=(12, 8))

    # axis1, show image
    ax1 = plt.subplot(2, 1, 1)
    img_rgb = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
    ax1.imshow(img_rgb)

    # axis2, show intensity histgram
    ax2 = plt.subplot(2, 1, 2)
    color_channel = ('blue','green','red')
    for i,col in enumerate(color_channel):
        histr = cv2.calcHist([img],[i],None,[256],[0,256])
        ax2.plot(histr,color=col, label=col)
        ax2.set_xlim([0,256])

    ax2.legend()
    ax2.set_xlabel('Values')
    ax2.set_ylabel('Intensity')
    ax2.grid(True)

    plt.show()