[Ktulu]

I'll use this WIP Target Field as an example.

Open the file(s) in your image editor of choice. I use GIMP. (Generally you'll want to work on either the Day or Night files and then copy over your finished work to the other file once you are done.) Create a copy of the original layer and then make it invisible. This is so you always have a reference point and can go back to an original element if needed.

Now you basically want to add your logos or text or whatever. To do this always add them as their own individual layer. Place them over the top of the original elements using them as a reference point. Make sure they don't occupy more space than the original element. At the same time you can have the park loaded in the ballpark editor in OOTP so you can figure out what is used where. To test your changes simply export your file as a webp file replacing the original (In GIMP you have to merge all the layers down to one or else the webp file won't work properly). In game simply reload the 3D Model and make sure the proper time of day is selected.

For the Alphablend file you may want to remove certain elements. In this example I removed the CF Twins structure and replaced it with a Lion logo. I also stole the lattice structure thing to make it look like scaffolding for the Lion. When deleting elements from the original, I recommend first copying them and pasting them as a new layer and making them invisible. This lets you easily toggle them back on and off as a size reference. For example I copied and hid the retired numbers, in the future I can use them as a reference for adding my own retired numbers.

Once I'm closer to completion I want to add the changes to the Night file(s). Because there are slight differences in lighting between the files (example luxury boxes have lights on at night) I don't want to just copy the entire Day file over top of the Night. Instead I'll simply hide the base layer of the Day file so that only my changes are visible. I then copy all visible layers and paste it into the Night file. You may then also have to make changes to the Night file if you removed some elements.

So that's basically it. You don't have to be a graphic design wizard, I'm certainly not. If you can work with layers, copy & paste, resize things it's pretty easy to fully convert a stadium to a fictional team.