how to pass output of aone pushbutton to act as input to the other push button?

actually i am reading an image in a pushbutton and now i have to resize this image through other push button and many more conversions(rgb2gray,image matching) but i dont wan to read image for every conversion so i want the code that can create and save a output variable from 1st push button and i can have it as input to the other .

[Walter Roberson]

Duplicate question. Copied to http://uk.mathworks.com/matlabcentral/answers/261689-how-can-i-pass-the-output-of-one-pushbutton-to-read-as-input-to-the-other-i-have-posted-my-code-her