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pythonopencvsize
Andrea Diaz
Andrea Diaz

Reputation: 1188

Image size (Python, OpenCV)

I would like to get the Image size in python,as I do it with c++.

int w = src->width;
printf("%d", 'w');

Upvotes: 57

Views: 287368

Answers (8)

Vilas
Vilas

Reputation: 51

You can use image.shape to get the dimensions of the image. It returns 3 values. The first value is height of an image, the second is width, and the last one is number of channels. You don't need the last value here so you can use below code to get height and width of image:

height, width = src.shape[:2]
print(width, height)

Upvotes: 0

Javi
Javi

Reputation: 1211

from this tutorial: https://www.tutorialkart.com/opencv/python/opencv-python-get-image-size/

import cv2

# read image
img = cv2.imread('/home/ubuntu/Walnut.jpg', cv2.IMREAD_UNCHANGED)

# get dimensions of image
dimensions = img.shape

# height, width, number of channels in image

height = img.shape[0]
width = img.shape[1]
channels = img.shape[2]

from this other tutorial: https://www.pyimagesearch.com/2018/07/19/opencv-tutorial-a-guide-to-learn-opencv/

image = cv2.imread("jp.png")

(h, w, d) = image.shape

Please double check things before posting answers.

Upvotes: 5

Harrison Wang
Harrison Wang

Reputation: 146

I believe simply img.shape[-1::-1] would be nicer.

Upvotes: 0

cowhi
cowhi

Reputation: 2215

Using openCV and numpy it is as easy as this:

import cv2

img = cv2.imread('path/to/img',0)
height, width = img.shape[:2]

Upvotes: 156

Roei Bahumi
Roei Bahumi

Reputation: 3673

Here is a method that returns the image dimensions:

from PIL import Image
import os

def get_image_dimensions(imagefile):
    """
    Helper function that returns the image dimentions

    :param: imagefile str (path to image)
    :return dict (of the form: {width:<int>, height=<int>, size_bytes=<size_bytes>)
    """
    # Inline import for PIL because it is not a common library
    with Image.open(imagefile) as img:
        # Calculate the width and hight of an image
        width, height = img.size

    # calculat ethe size in bytes
    size_bytes = os.path.getsize(imagefile)

    return dict(width=width, height=height, size_bytes=size_bytes)

Upvotes: 2

Stein
Stein

Reputation: 809

For me the easiest way is to take all the values returned by image.shape:

height, width, channels = img.shape

if you don't want the number of channels (useful to determine if the image is bgr or grayscale) just drop the value:

height, width, _ = img.shape

Upvotes: 31

Rodrigo Lara
Rodrigo Lara

Reputation: 181

I use numpy.size() to do the same:

import numpy as np
import cv2

image = cv2.imread('image.jpg')
height = np.size(image, 0)
width = np.size(image, 1)

Upvotes: 18

halex
halex

Reputation: 16403

Use the function GetSize from the module cv with your image as parameter. It returns width, height as a tuple with 2 elements:

width, height = cv.GetSize(src)

Upvotes: 22

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