How to prevent Unity 5 from compressing imported high resolution image?

I am working on a space flying game with Unity 5. I am planning to use a high resolution photo(77284928, 18.9MB) of the universe as the background. But Unity 5 always compressed the image down to 20482048 whenever I tried to import the image as asset. Is there a way to stop Unity from doing the compression? I’d like to keep the original resolution of the photo if possible.

  1. Select your image inside Assets folder
  2. In Inspector your should now see Import Settings
  3. Make Max Size big enough so it doesn’t compress your image anymore
  4. Click Apply

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