Build memory usage

I am working on a 2d action/ platform and i'm encountering a memory usage error when i try to build it. My system has 3 Gb ram but I've heard Unity consume a huge amount of memory upon building apps. What can i do to reduce it? I'm using the free Psm version of Unity. I've tried changing the Sprite filter to Point but i don't know what else to do from there. Current resolution is 1024 but lowering it destroys the image files. How can i reduce memory use without reducing the quality of my images?

 

compress the images , convert them to DTX make texture atlas ... avoid to use png images

 

Thanks for the help. Which image format is the best use for image files?

 

you can only convert to DTX in unity psm

 

I build my game and found in the Editor Log the following:

Build Report
Uncompressed usage by category:
Textures 12.8 mb 17.6%
Meshes 0.0 kb 0.0%
Animations 0.0 kb 0.0%
Sounds 53.9 kb 0.1%
Shaders 0.0 kb 0.0%
Other Assets 36.6 kb 0.0%
Levels 51.9 kb 0.1%
Scripts 2.0 mb 2.8%
Included DLLs 6.4 mb 8.9%
File headers 16.4 kb 0.0%
Complete size 72.4 mb 100.0%

How can this sum result in 72.4 MB

 

psm is no more supported , if you have any question you should post them on sony dev forum