As far as I can see you can do such things in Titanium only if you're working on a native app, not a hybrid app. As suggested in your previous thread, you can do this in a hybrid Cordova app by using a Cordova plugin that supports your requirements. I could not find a plugin for adding overlay to an image, so if you need this functionality, you can be the one to create it. You can review these plugins that edit an image to get an idea how it is done:
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