Images the same resolution as screen get scaled

Question

Images that have the same resolution as the screen on either plane are not fully pixel mapped when shown in full, but suffer a loss in sharpness along the center axis due to scaling. While not readily visible in most images, it is an undesirable and unnecessary artifact.
Replication steps:
1. Create an image the same resolution as the phone's screen, e.g. 1080x1920 pixels, and fill it with a 2x2 pixel checkerboard pattern (every other pixel white and every other pixel black). Save it as PNG, or as JPEG with minimum compression.
2. Copy the image to the phone (e.g. the Pictures folder).
3. View the image at full size using Album, oriented the same direction as the screen such that it should display pixel mapped.
4. Observe the loss of sharpness that occurs as neighboring pixel values are blended in areas of the image.
This problem was observed on an Xperia Z3 with Album version 6.6.A.0.6 and earlier.
I'll try putting together some examples later and add them to this thread.

Answer 1

iPod:
4-inch (diagonal) widescreen display with Multi-Touch IPS technology
Retina display
1136-by-640-pixel resolution at 326 pixels per inch
800:1 contrast ratio (typical)
500 cd/m2 max brightness (typical)
Fingerprint-resistant oleophobic coating
iPhone:
Retina display
4-inch (diagonal) widescreen Multi-Touch display
1136-by-640-pixel resolution at 326 ppi
800:1 contrast ratio (typical)
500 cd/m2 max brightness (typical)
Fingerprint-resistant oleophobic coating on front
Support for display of multiple languages and characters simultaneously