I need to color a pixel in an image. I use opencv and python.
I tried img[x,y]=[255 255 255] to color a pixel(x,y) but it wont work :(
Is there is any mistake in this?
Can you suggest any method?
Thanks in advance.
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3 Answers
img[x,y]=[255, 255, 255] is wrong because opencv img[a,b] is a matrics then you need to change x,y then you must use img[y,x]
actualy mistake in the order of x,y
if you want to change color of point x,y use this >> img[y,x] = color
Comments
Try it with comma's between the 255's:
img[y,x]=[255, 255, 255]
Comments
This works for me, just change it to load your own image:
import cv2
img = cv2.imread("C:\calibrate\chess\color001.jpg", cv2.CV_LOAD_IMAGE_COLOR);
## Make pixels row and column 300-400 black
img[300:400,300:400] = (0,0,0)
cv2.imshow('title',img)
cv2.waitKey(0)
cv2.destroyAllWindows()
6 Comments
Prasika
the code is (x,y),radius = cv2.minEnclosingCircle(cnt) . here (x,y) is a center point.I want to color the center point .so I use img[x,y] .Is this wrg? how can I represent the center point?
Deepfreeze
First try if my code is working for you to color pixels. Than you can say that this has answered you question. The other question -> print out the x,y coordinates and check if they are what you would expect. Perhaps 1 pxl is to small to see.
Prasika
Ur code is wrking to color a block of pixels.I print x,y .The o/p is(97,417).It is x,y coordiante of a pixel.Am i ryt? I need to color a point img[97,417]=(0,0,0). For tat It is not wrking :(
Deepfreeze
You probably need to use img[417,97]=(0,0,0)
Prasika
It shows the following error msg : " img[417,97]=(0,0,0) ValueError: setting an array element with a sequence. "
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