exam

## module 03
## exercise 05
## simple look-up tables: brightness and contrast

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

## load image
img = cv2.imread('/home/pi/Workfolder/images/bear.bmp',0)

## changing brightness by simply adding a scalar:

dst = cv2.add(img,100)

## changing contrast by muliplying with a scalar:
dst2 = cv2.multiply(img,2)

## display images
plt.subplot(121),plt.imshow(img, cmap = "gray"),plt.title('Original')
plt.xticks([]), plt.yticks([])
plt.subplot(122),plt.imshow(dst, cmap = "gray"),plt.title('Brightness')
plt.xticks([]), plt.yticks([])
plt.subplot(122),plt.imshow(dst1, cmap = "gray"),plt.title('Contrast')
plt.xticks([]), plt.yticks([])
plt.show()