This plugin is similar to Atmosphere Shaders plugin. It has 3 versions, increases contrast, makes dark colors slightly blue-ish, and makes colors look "warmer", so I decided to make it a separate plugin.
"Sunshine" - the main version.
"Sunshine (HC)" (High contrast) - crispier version
"Sunshine (LC)" (Low contrast) - less contrast version
"Sunshine (S)" (Sunset) - Darker colors, reddish light (constant sunset effect)
If you have any suggestions/problems, please tell in comments. I may slightly change the color, contrast/brightness/etc. in future.
Update 1 (20.11.2022) - Color changes - they're not that extreme anymore, added Sunset option, now shaders don't affect game ui or text.
Notes:
The preview shows normal sunshine & sunshine HC shaders, not default & normal sunshine shaders.
You need to enable the shader in settings (graphics tab) after installing it.