Using FromArgb for Int32[] value results in swapped Red and Blue values - powershell

Question

I have this Int32[] value 14508153 which should be:
R : 121
G : 96
B : 221
If I use:
[System.Drawing.Color]::FromArgb(14508153)
It returns:
R : 221
G : 96
B : 121
A : 0
IsKnownColor : False
IsEmpty : False
IsNamedColor : False
IsSystemColor : False
Name : dd6079
Questions
How or why are those values swapped for R and B using that function?
Is there a built-in PowerShell method to convert them correctly?

Answer 1

I can't speak to why the bytes need to be rearranged (see the bottom section for thoughts), but here's how you can do it:
Add-Type -AssemblyName System.Drawing
$bytes = [System.BitConverter]::GetBytes(14508153)
[byte[]] $rearrangedBytes = $bytes[2], $bytes[1], $bytes[0], $bytes[3]
[System.Drawing.Color]::FromArgb(
[System.BitConverter]::ToInt32($rearrangedBytes, 0)
)
See System.BitConverter.GetBytes(), System.BitConverter.ToInt32().
The above yields:
R : 121
G : 96
B : 221
A : 0
IsKnownColor : False
IsEmpty : False
IsNamedColor : False
IsSystemColor : False
Name : 7960dd
It appears that only 3 of the bytes in your [int] (System.Int32) value are relevant, and that they are in Big-Endian order (see the Wikipedia article about endianness).
By contrast, System.Drawing.Color.FromArgb() expects all 4 bytes to be relevant, in Little-Endian order.