Converting colored segment of image to white

Question

I am trying to use python OpenCV to convert Bill's segmented image to white color but have been unsuccessful in doing so. I would essentially like create a white silhouette of Bill in a black background. I have stored the image in a variable called:

bill

Any solutions or direction will be highly appreciated. Thank you

This is the silhouette version of bill when applying the code suggested by frab:

graybill = cv2.cvtColor(bill, cv2.COLOR_BGR2GRAY)
graybill[bill > 0] = 255

Answer 1

The easiest way is:

1. Convert image to grayscale

   graybill = cv2.cvtColor(bill, cv2.COLOR_BGR2GRAY)

2. Set all values of matrix equal to 255 if the value is greater than 0 (black)

   graybill[graybill > 0] = 255

An alternative is to use threshold from cv2:

ret,thresh1 = cv.threshold(img,1,255,cv.THRESH_BINARY)