Getting started with object design

Hi to all, I'm new to object design and I am designing an image
organizer application (similar to Picasa). For image handling
operation I have a class that interacts with the image processing
component, and a Facade for that class. I also have a class that deals
with GUI operations (for example, when you select a certain option,
some data must be gotten from database and the screen must be updated
to showit... GUI class would be doing that screen update operation).
As a part of the GUI, I need to design an image composed of other
images, and that involves to sequentially call methods implemented by
the image processing class. My question is: Which would be the class
which should implement a method (for example, getComposedImage) that
do those sequential calls to the image class?

Thanks in advance!
Andrea Giorgetta
PD: Sorry about my English, I am from Argentina, so it's not my
primary language.

.

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