GUIDE, images, memory issue

Hello, I have a memory Issue.

I am capturing upto 500 images (12 bit tiffs) and storing them in an array.

I preallocate memory:

numImages=500;   %Maximum number of images in a stack
global imgArray;
imgArray=cell(numImages,1

Then in another function that captures the images (and adds to an exes component created using GUIDE),

I add to the image array

axes(handles.axes1);  cla reset;    %Remove any previous graphics on the axes
global imgArray;
imgArray{nextImgIdx}=img;

What I've noticed is at the end once I have finished, I have a seperate function that supposed to clear these images from memory, but looking in task manager, Im still seeing about 3G RAM being taken up from matlab.

%Function to clear memory taken from images
axes(handles.axes1);  cla reset;    %Remove any previous graphics on the axes
imgArray=[];

Answer 1

[Jason]

Seems I forgot to put global in my clear function

global imgArray
imgArray=[];