Find Pixel Position of a Cell

I am trying to use the getpixel function to find the color of the middle pixel in each cell starting from cell AA1. However, currently when I run the code, it selects pixels starting from the top left corner of my monitor, instead of from cell AA1. Anyone know what I can do to specify the pixel position of a cell AA1? I thought that the .left .top method would work. The bolded part of the following code is what I'm talking about. Thanks for the help!

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