Matlab 3-layered Image Matrix -


I am currently learning matlab and treat troubles as an image section. I have this PowerPoint slide about the matlab image:

**** Image matrix *

3 -Star image matrix - read 'A' rainbow Jpga ???? IM

IM2 for subset IM ??? E.g. (155: 184, 145: 164, :)

* 1 layer of an image ??? Find the red layer in IM2 ****

I want to ask (155: 184, 145: 164, :) What does that represent? What does each value represent in parentheses? Apart from this, what does the semi-colon signify?

Thank you!

Say that you have 3 dimensional matrix A and you are listing your matrix. I will use the example given above: 

  A (155: 184,145: 164, :)   
  155: 184  In the first entry, means to carry 155 to 184 rows, take the column from 145 to 164 in the second entry, and in the last entry the semi-colon means that every element with the third dimension is meant. So if you have  200x200x3 , then the semi-colon will take 3 dimensions.

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