CODEWITHSUNDEEP
pythonopencvcomputer-vision
Rory Lester
Rory Lester

Reputation: 2918

Get RGB value opencv python

I am loading an image into python e.g. 

image = cv2.imread("new_image.jpg")

How can i acccess the RGB values of image?

Upvotes: 20

Views: 115811

Answers (6)

Rohit Salunke
Rohit Salunke

Reputation: 1103

Get B G R color value of pixel in Python using opencv

import cv2
image = cv2.imread("sample.jpg")
color = int(image[300, 300])
# if image type is b g r, then b g r value will be displayed.
# if image is gray then color intensity will be displayed.
print color

output:

[ 73  89 102]

Upvotes: 10

oukt_oukt
oukt_oukt

Reputation: 13

It worked for me well :

import cv2 
import numpy as np  
  
cap = cv2.imread('/home/PATH/TO/IMAGE/IMG_0835.jpg')
#You're free to do a resize or not, just for the example
cap = cv2.resize(cap, (340,480))
for x in range (0,340,1):
    for y in range(0,480,1):
        color = cap[y,x]
        print color

Upvotes: 1

CHOI
CHOI

Reputation: 162

Below works.

import cv2

image = cv2.imread("new_image.jpg")

color = image[y, x]

blue = int(color[0])
green = int(color[1])
red = int(color[2])

Upvotes: 3

Jayanga Vithana
Jayanga Vithana

Reputation: 63

This code will print the red , green and blue value of pixel 300, 300:

img1 = cv2.imread('Image.png', cv2.IMREAD_UNCHANGED)
b,g,r = (img1[300, 300])
print (r)
print (g)
print (b)

Upvotes: 5

chilin
chilin

Reputation: 416

I think the most easiest way to get RGB of an image is use cv2.imshow("windowName",image). The image would display with window, and the little information bar also display coordinate (x,y) and RGB below image. Like this picture. You are allowed to use mouse to see the RGB of any pixel you want.

Code example:

import cv2

image = cv2.imread("new_image.jpg")
try:
    cv2.imshow("windowName",image)
    cv2.waitKey(0)
except:
    print("No this image")

Upvotes: 0

Yamaneko
Yamaneko

Reputation: 3563

You can do 

image[y, x, c]

or equivalently image[y][x][c].

and it will return the value of the pixel in the x,y,c coordinates. Notice that indexing begins at 0. So, if you want to access the third BGR (note: not RGB) component, you must do image[y, x, 2] where y and x are the line and column desired.

Also, you can get the methods available in Python for a given object by typing dir(<variable>). For example, after loading image, run dir(image) and you will get some usefull commands:

'cumprod', 'cumsum', 'data', 'diagonal', 'dot', 'dtype', 'dump', 'dumps', 'fill',
'flags', 'flat', 'flatten', 'getfield', 'imag', 'item', 'itemset', 'itemsize', 
'max', 'mean', 'min', ...

Usage: image.mean()

Upvotes: 17

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