import numpy as np
import cv2
def ptext(img1,s,pos,sz):
    img2=cv2.putText(img=img1,text=s,org=pos,
      fontFace = cv2.FONT_HERSHEY_DUPLEX,
      fontScale=sz,color=(0,255,0),thickness=1)
    return img2
hsv=np.zeros((40,600,3),dtype=np.uint8)
for j in range(29):
    HSV=[170,200,10+10*j]
    hsv[:,:]=np.array(HSV)
    BGR=cv2.cvtColor(hsv,cv2.COLOR_HSV2BGR)
    a=str(j)+' '+str(HSV)+' '+str(BGR[0,0,:])
    img2=ptext(BGR,a,(30,30),1)
    print(a); 
    cv2.imshow('img2',img2)
    if(j==0): imgv=np.copy(img2)
    else: imgv=np.vstack((imgv,img2))
    cv2.imshow('imgv',imgv)
    cv2.waitKey(0)
cv2.imwrite('HSV_RED_200_V.png',imgv)