People come here for solutions and often it is found in chronicled conversations. Yours, seems like a PM, brought public, without any attempt to chronicle the problem and solution. The original post:
I have started creating the terminal at KCSG Columbus Georgia Airport. I want to create night textures in FSX. That involves illuminating the letters in this sign, letters ONLY. Can anyone help.
"Need help, night textures FSX," and the reply:
Hello..
Select the blue area only and copy it in a new layer. Now this layer should be in a clear background (checkerboard). Nothing else really needs to be done.
Of course, this depends on what you are using to texture it too.
I feel like, anyone reading along, besides the OP, would either be intuitive on a psychic level, or lost. Maybe I am just projecting my dumbness, but I think, other people as dull as me, might also want to create night textures, those poor souls.
My technique for creating night textures, seems very simple, inside my own little echo chamber. I use the same day texture and select the elements I want illuminated, windows, etc, those remain unedited. The rest of the image gets darkened with black, 90% opacity. That image is saved to .DDS format and renamed with a night map suffix "_LM," if I am using FSX or P3D, saved to .png, if I am using MSFS. I use MCX to assign the texture to the model and in the case of MSFS, the final result must be compiled with fspackagetool.exe.
Now, there are other details, like color shading, or also, slightly darkening the illuminated elements, because using the same daytime brightness, in night time window textures can be too bright, but this technique should get someone started.
So we see, there are many ways to skin a cat and we can fervently hope the sum total of those are euphemisms, but I am glad your situation is resolved and I feel like this thread also has some ideas how to make night textures, for people to find.