Size of an image?

I got the image size as below when i use size('image_name'). What does this 3 means?

>> size(image)

ans =

   204   204     3

Answer 1

[Adam]

It means it is a true RGB image with Red, Green and Blue data channels rather than an indexed image that requires a colourmap to visualise it.

[SNEHA P S]

Thank you