BACKGROUND ICON REZ FOR 4K TV 3840 X 2160 REZ OPEN CORE?

[DASBOOT5]

Using a background from BlackOSx Gallery: BlackOsx Themes in particular BsxRedOldApple: RedOldApple it is noted in their readme that only one background should be in the folder as there are several different aspect ratios and monitor resolutions in the background folder. Since the machine I will be using is an HTPC attached to a 4K Roku TCL tv with a native resolution of 3840 X 2160 should the background icon (.ICNS) be at the same aspect ratio when created as a .PNG, be double the rez; ie 7680 x 4320 then converted to .ICNS using Icnspack-builder (IcnsPack-builder)? My current background .icns is at 5120 x 2880 converted is considerably smaller than the viewing area on my TV but fully fills the viewing area on my 2K monitor. (2560 x 1440). Is there a maximum resolution that the Mac OS can handle at the OpenCore Bootloader screen Picker Variant, and is 7680 x 4320 safe, and will it display at 3840 X 2160?

from the IcnsPack builder institutions:
Create image Background 3840x2160 in 144 pixels ➤ this is for 1920x1080 screen
Create image Background 5120x2880 in 144 pixels ➤ this is for 2560x1440 screen
No info for a 3840 x 2160 screen.

 

[Striker]

Using a background from BlackOSx Gallery: BlackOsx Themes in particular BsxRedOldApple: RedOldApple it is noted in their readme that only one background should be in the folder as there are several different aspect ratios and monitor resolutions in the background folder. Since the machine I will be using is an HTPC attached to a 4K Roku TCL tv with a native resolution of 3840 X 2160 should the background icon (.ICNS) be at the same aspect ratio when created as a .PNG, be double the rez; ie 7680 x 4320 then converted to .ICNS using Icnspack-builder (IcnsPack-builder)? My current background .icns is at 5120 x 2880 converted is considerably smaller than the viewing area on my TV but fully fills the viewing area on my 2K monitor. (2560 x 1440). Is there a maximum resolution that the Mac OS can handle at the OpenCore Bootloader screen Picker Variant, and is 7680 x 4320 safe, and will it display at 3840 X 2160?

from the IcnsPack builder institutions:
Create image Background 3840x2160 in 144 pixels ➤ this is for 1920x1080 screen
Create image Background 5120x2880 in 144 pixels ➤ this is for 2560x1440 screen
No info for a 3840 x 2160 screen.

Keep both of the PNG(S) in 3840x2160. That will work fine.