无法更改轮廓的颜色

Question

我已经编写了代码以找到轮廓并为其着色。但是视频无法保存，但可以成功运行。

我认为我将问题范围缩小到两行代码，当我对它们进行评论时，视频将保存，但将以灰度显示，这是我不想要的。

#change to black and white
gray = cv2.cvtColor(frame, cv2.COLOR_RGB2GRAY)


gaus = cv2.adaptiveThreshold(gray, 255, cv2.ADAPTIVE_THRESH_GAUSSIAN_C, 
cv2.THRESH_BINARY, 115,50)
frame = gaus






#Bluring the video
blur = cv2.GaussianBlur(frame,(15,15),cv2.BORDER_DEFAULT)
frame = blur

# Canny Edge
Canny = cv2.Canny(frame ,25,50)
frame = Canny


# Contours
contours,hierachy= cv2.findContours(frame,cv2.RETR_TREE,cv2.CHAIN_APPROX_SIMPLE)

index = -1
thickness = 5


# these two lines bellow are preventing the file from being saved

img2 = cv2.cvtColor(frame, cv2.COLOR_GRAY2RGB)
frame = img2




cv2.drawContours(frame, contours, -1, (255,0,0), thickness)

# Save the video



cv2.imshow("frame", frame)

out.write(frame)