screenresolution, imageresolution and ppi

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Samsung Galaxy s6 has a screen density of 577 ppi which maps to xxhdpi - xxxhdpi

Screen resolution: 1440 X 2560

Samsung Galaxy S3 has a screen density of 306 ppi which maps to xhdpi

Screen resolution: 720 X 1280

My app with a lot of scenic images was developed against xhdpi-devices (i.e. S3) but to have margins against the future the images has a resolution of:

Image resolution: 1300 X 1950

So - what happends with images with this resolution when put in a xxxhdpi device such as Galaxy S6? I compiled the app against an S6 and cannot see any difference. Is this because the images are in the xhdpi-folder and s6 thanks to this does not use the full density of 577 ppi? My theory - IF it have used the full capacity - the images whould have been stretched out since the width is 1300 px and the screenwidht of S6 is 1440.

Greatful for answers

EDIT: the images uses the whole screenwidth.

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