pixel size of the image in matlab different from that of original pixel size

I am using MATLAB 2019b

I am facing the issue where the pixel size of the image is different from what MATLAB is giving as the pixel size of the image. I have tried using imread funciton of MATLAB it is showing the pixel size given in MATLAB. I am facing this issue only incase of this image and not incase of other images.

Any kind of suggestion or advice is appreciated

[Uday Pradhan]

Hi,

I downloaded the attached image and did not notice the said difference in dimensions. Notice that you are comparing the sizes of image - "RGB_108.png" imported to MATLAB while the below dialogue box is for image "RGB_001.png" which I believe is a different image.

[P Sai Venkat Kushal]

Hi uday

Thank you for your reply

can you please tell me what is the pixel dimension you are getting?

The dialog box it was my mistake for keeping the one for RGB_001.png but the size of RGB_108.png is indeed 720x720x3 I checked it using python opencv also

[Walter Roberson]

Perhaps you are looking at the information for a file in a different directory?

My system says the image is 500 x 500 x 3

[Uday Pradhan]

Sai, please check the screenshot attached. The RGB_108.png which you have attached has dimensions 500 x 500 according to the Properties dialog.

Answer 1

[Vinai Datta Thatiparthi]

Hi Sai,

The image that you've shared on the community, I've also noticed that it's size is 500x500x3. Even in the properties of the image, you'll notice the "width" & "height" as 500 respectively. Also, notice that the "Bit Depth" is 24, indicating 3 channels, therefore resulting in size of the image as 500x500x3. For instance, in a grayscale image, the "Bit Depth" would have been 8 instead.

If the information from MATLAB and properties pane don't match, then a reasonable explanation could be that you're probably working on two different images (like was pointed out by @Walter).

Hope this helps!