HyurticesVal

I really hope that this isn't a dumb question, however I just started messing around with UI's. I made a simple targeting ring, I first created a template sized 260pxl x 2048pxl, as my background, then proceeded to create different layers which I manipulate. I create the template and layers with Microsoft Picture It simply because it is a lot easier to manipulate the layers than my Photoshop CS.

After I am satisfied with what I have I then save the templates to Photoshop in the tga format. However this results in a file that is about 1.5 megs in size, which is far to large to upload. How the heck can I make the tga files smaller in size say around 150 Kb? I save the tga files which are 260 pxl by 2048 pxl at a resolution of 72 pxl.

What am I doing wrong?

HyurticesVal