Getting rows and columns of image

I have color jepg image.

I got the following output for imfinfo

>> I=imfinfo('D:\images\im.jpg');
>> I

I = 

             Filename: 'D:\images\im.jpg'
          FileModDate: '03-Jul-2008 01:10:24'
             FileSize: 184721
               Format: 'jpg'
        FormatVersion: ''
                Width: 500
               Height: 500
             BitDepth: 24
            ColorType: 'truecolor'
      FormatSignature: ''
      NumberOfSamples: 3
         CodingMethod: 'Huffman'
        CodingProcess: 'Sequential'
              Comment: {}

But when I try to get no of columns and rows from the matrix of the same image I got

I=imread('D:\images\im.jpg');
[r1 c1]=size(I);
>> r1

r1 =

     500

>> c1

c1 =

          1500

I am getting 500 which is correct rows but 1500 value for column. Why? Is this for 500 * 3 for 3 different channels?

Answer 1

[Image Analyst]

Try this:

[rows, columns, numberOfColorChannels] = size(rgbImage);

For more on this, see Steve's blog: http://blogs.mathworks.com/steve/2011/03/22/too-much-information-about-the-size-function/

Don't use capital I for a variable name. It looks too much like a 1 (one) and an l (lower case L), plus it's not very descriptive.

[Kyul KIM]

thanks a lot!