This simple operation had a steep learning curve :-)

(This is a rough draft.)

How to enlarge certain MoI PNG image files, which have a transparent background, to improve visibility for 4K monitors. (Mine is 28 inches +/-)
Applies to MoI5 beta, and MoI4.
Used on 6 MoI PNG files for Edit Frame located in MoI ui folder. (Or Themes folder for MoI5 beta?), namely:
GripFrameCorner, GripFrameCorner_highlighted,
GripRotation, GripRotation_highlighted,
FrameOrigin, FrameOrigin_highlighted.

This method uses pixlr.com online program PixlrE, which is at pixlr.com/e.

1. Copy the 6 default PNG files to a working directory, such as Libraries > Documents > savedPNG. The pixlrE program is fussy about which directories it will save modified PNG files to.

2. Rename the 6 PNG files in the .ui folder to *BAK.PNG. (e.g.)

3. Go to the pixlr.com website and select pixlrE program.

4. Load one of the 6 PNG files into pixlrE.

5. In the menu, pick Select > pixels. This will highlight the non-transparent pixels.

6. In the menu, pick Edit > Free Transform. This causes a cage with blue squares to appear. For the 2 GripFrameCorner PNG's, Drag the upper right square to maximize the non-transparent pixels, in the existing PNG. For the centered "icons" adjust all of the boxes to (slightly) enlarge. The centered icons only have a limited space to be enlarged.
Apply the Transform.

7. Select File Save, as PNG, and save to Libraries > Documents.

8. Repeat for the other 5 PNG files.

9. Copy the 6 new PNG files to the MoI5beta .ui file.
(Or Themes?) (Or else to MoI4 .ui file. (Assumes PNG's are the same as for MoI5beta.)

- Brian

The 6 PNG images on MoI screen are still small, but are a bit larger, and more legible, IMHO.

Do NOT increase the 64 X 64 PNG pixel size.

The 6 resulting PNG's, which are slightly larger, attached.
(Subject to approval or disapproval of Michael.)