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Bundling images in apps

While iOS treats images and assets as distinct items,
Flutter apps have only assets. Resources that are
placed in the Images.xcasset folder on iOS,
are placed in an assets’ folder for Flutter.
As with iOS, assets are any type of file, not just images.
For example, you might have a JSON file located in the my-assets folder:

Declare the asset in the pubspec.yaml file:

assets

my-assets/data.json

And then access it from code using an AssetBundle:

For images, Flutter follows a simple density-based format like iOS.
Image assets might be 1.0x, 2.0x, 3.0x, or any other multiplier.
The so-called devicePixelRatio
expresses the ratio of physical pixels in a single logical pixel.