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Please explain the results of the code provided

Posted on 2009-04-02
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Last Modified: 2016-02-10
when I run the code below for the attached image, I get

450   348     3

It is not very clear in the Matlab help files.
Which is colum length and which is row length?
How come there are three responses here? Shouldnt there just be length by width?
What is 3?
I=imread('lightbulb', 'jpg');
d=size(I)

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lightbulb.jpg
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Question by:jtiernan2008
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yuk99 earned 250 total points
ID: 24053610
With the first line you read the image file into 3-dimentional array mxnx3. m is your image height in pixels, n - width and 3 means 3 layers of RGB colors for each pixel - red, green and blue.
So the second line will give the dimensions (size) of your array in the form [m n 3].
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by:yuk99
ID: 24053634
Be the way, you can see documentation of any function in Matlab with the command:
doc function_name
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by:yuk99
ID: 24053656
First number after size function is always number of rows (it's 1st dimension), second - number of columns, third - pages (or layers), and so on.
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