image array value changes after execution in python -


i new python , working on image processing based project. working on spyder on windows , using ipython console. image when converted array becomes array ranging 0-255 values. doing:

image = cv2.imread("imagetest.png") im = image.astype('float') im[5,5,0] = 3000 # changing pixel value cv2.imwrite("save.png", im) # open image again check if pixel still same or not image = cv2.imread("save.png") im = image.astype('float') if im[5,5,0] == 3000:     print "yes" else:     print "no"

the problem is, whenever open image check, pixel value changed , goes default value ( whatever have been before modification ). why happening? there way in can save manipulated pixel image , retrieve while checking?


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