Decrease Size of Image Files

In order to reduce the size of our game's apk file, we used an image optimization software called, ImageOptim, available here http://imageoptim.pornel.net/.   Here is the description of the product:

ImageOptim optimizes images — so they take up less disk space and load faster — by finding best compression parameters and by removing unnecessary comments and color profiles. It handles PNG, JPEG and GIF animations.

It was very simple to use and delivered on its promise.  We were able to reduce the size of the apk file by 2MB by using jpeg images for the backgrounds and running all of the other png files through this software.  Screen shot is shown below.