tns resources generate splashes are the wrong size

Environment

  Getting NativeScript components versions information...
✔ Component nativescript has 6.8.0 version and is up to date.
✔ Component tns-core-modules has 6.5.15 version and is up to date.
⚠ Update available for component tns-android. Your current version is 6.5.0 and the latest available version is 6.5.3.
⚠ Update available for component tns-ios. Your current version is 6.5.0 and the latest available version is 6.5.2.

Describe the bug

When running tns resources generate splashes image.png the android splash screens are very small.
I tried with different sizes of input image, all corresponding to a scale up of xxxhdpi. Still, very small. Tried with a square image instead of 1920x1080, same result.

To Reproduce

• Create an image, 1920x1080, or anything bigger/smaller
• tns resources generate splashes image.png
• Go to the Android's xxxhdpi resources folder.
• The image is like 640px

Expected behavior
Images the right size, but I'm really not sure what it's expecting as an input. Bigger files with special names for IOS?
I ended up using http://images.nativescript.rocks/

Start by reproducing tns resources generate splashes image.png with the reported image sizes and inspect the generated Android xxxhdpi resources. Trace the CLI entry point for splash generation to identify how output dimensions are calculated. Done means generated splash images have the expected dimensions for the supported platforms.