Situation:
I am using Seamless Loading Screen together with shaders and Tips mod in my modpack which is on Minecraft 1.18.2, Forge 40.2.4.
Problem: Sometimes, esp. in snowy biomes, the saved screen is so bright that you cannot read the overlayed tips very well, because they're white.
I also tried to approach this with the Fancy Menu mod but it's incompatible with using your screen image so... I can scrap that.

Hence my idea:
Add an extra layer on top, that can be enabled/disabled via config. It can be any image, also supporting transparency. When loading the game, it gets put on top of the existing background image. Like a watermark. The image is saved in an extra folder in the configs. You place it inside and it picks it. You can choose which window corner it gets pinned to, for resizing purposes, and whether it can be scaled or just gets cut off if you scale the game window down.
I would do this myself if I could. I have no experience with such things though so I doubt I would succeed. Hope this is possible.