Text rendering with alpha in Color renders incorrectly
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Description
There appears to be a bug with the rendering of text where the associated color contains an opacity (alpha). See the linked discussion.
@miloush noted that the issue is dependent on the font size and affects `` and `` as well.
### Discussed in https://github.com/dotnet/wpf/discussions/7710
Originally posted by **brinko99** April 11, 2023
I’m trying to implement a text color in WPF that matches CSS RGBA of `#00,00,00,0.72` on a white background. I’d expect that to be a color of `#B8000000` (alpha of dec 184 ≈ .72), yet the result is much lighter than expected. Applying opacity to the control itself works as expected.
I'm expecting the composite color to be `#474747` as produced by CSS and paint.net, but I'm getting `#8C8C8C`. Does WPF render alpha on a brush differently somehow?
Here is an example:
```
```
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