def increase_brightness_GUI (label):
'''Implement the increase_brightness function from img_manip.'''
#Clear all the temp pics in front of the current pic current_pic
global temp_label
global current_pic
temp_label = temp_label[0:current_pic+1]
#Implement the function increase_brightness
label.picture = img_manip.increase_brightness(label.picture)
#Keep a copy of the current pic for the functions Undo and Redo
temp_label.append(label.picture)
current_pic += 1
#update the label
update_label(label)
def test_increase_brightness():
'''Test the function increase_brightness in img_manip.'''
new_pic = create_pic(4, 4)
new_pic_increase_bright= img_manip.increase_brightness(new_pic)
#The average brightness of new_pic_increased_brightness will likely not be
#exactly 10 more than that of new_pic because some RGB values may already be
#255 and cannot increase, so the function tests for a difference of 10 with
#an error of 2 rather than for strict difference of 10.
old_avg_brightness = avg_bright.average_brightness(new_pic)
new_avg_brightness = avg_bright.average_brightness(new_pic_increase_bright)
assert new_avg_brightness - old_avg_brightness - 10 < 2, \
"increase_brightness failed to increase the picture's average \