opencv color picker

cvpicker.py

#! /usr/bin/env python2

import cv2
import numpy as np

colors = []

def on_mouse_click (event, x, y, flags, frame):
    if event == cv2.EVENT_LBUTTONUP:
        colors.append(frame[y,x].tolist())

def main():
    capture = cv2.VideoCapture(0)

    while True:
        _, frame = capture.read()
        hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HLS_FULL)
        if colors:
            cv2.putText(hsv, str(colors[-1]), (10, 50), cv2.FONT_HERSHEY_PLAIN, 2, (0, 0, 0), 2)
        cv2.imshow('frame', hsv)
        cv2.setMouseCallback('frame', on_mouse_click, hsv)

        if cv2.waitKey(1) & 0xFF == ord('q'):
            break

    capture.release()
    cv2.destroyAllWindows()

    # avgb = int(sum(c[0] for c in colors) / len(colors))
    # avgg = int(sum(c[0] for c in colors) / len(colors))
    # avgr = int(sum(c[0] for c in colors) / len(colors))
    # print avgb, avgg, avgr

    minb = min(c[0] for c in colors)
    ming = min(c[1] for c in colors)
    minr = min(c[2] for c in colors)
    maxb = max(c[0] for c in colors)
    maxg = max(c[1] for c in colors)
    maxr = max(c[2] for c in colors)
    print minr, ming, minb, maxr, maxg, maxb

    lb = [minb,ming,minr]
    ub = [maxb,maxg,maxr]
    print lb, ub

if __name__ == "__main__":
    main()