What we are going to do now is that, replace the first index ( R color value let’s say) with a new value. It is a special kind of list where we can only change its values only if they are -1 first and nothing else. Here all the values were -1 initially representing the start stage of the list. In simple terms, take the below scenario: The same kind of thing is going on with the other 2 functions, just for different color trackbar values. Lastly, we update the bgr_track dictionary that keeps the track history of the last value and the same process repeats. Now we just put a new trackbar value, which is passed to the function as x with the color white in the same place. Here we need to first put the same text as the previous value, like 0 in this case, and change color similar to the background of the paint area (here it is black) so that it is like that it vanished from the paint area. In OpenCV, there is no feature that lets cv2.putText keep track of previous text on the same position so it could just replace it. Here we are trying to update the counter value of R: 0 on the image window.įirst, we get all global variables and try to replace the already present value of 0 against R. Next 3 functions are the same with just a difference of B, G and R.
We can use it to fulfill our need to pass it as a parameter where it is required but we want it to not do anything. We create a function like nothing that does nothing just do a simple pass. Import cv2 import numpy as np draw = False window_name = "Paint Brush Application" bgr_track = ", ( 190, 30 ), font, 0.5, ( 255, 255, 255 ), 1 ) bgr_track = x
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