brightness.py

# ImageDataGenerator brightness
datagen = ImageDataGenerator(brightness_range=[0.4,1.5])

# iterator
aug_iter = datagen.flow(img, batch_size=1)

# generate samples and plot
fig, ax = plt.subplots(nrows=1, ncols=3, figsize=(15,15))

# generate batch of images
for i in range(3):

	# convert to unsigned integers
	image = next(aug_iter)[0].astype('uint8')
 
	# plot image
	ax[i].imshow(image)
	ax[i].axis('off')