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MSFS Bump/Normal Map Issues

I'm trying to change the bump map texture for a plane as the original textures had the exits and related body panels in the wrong spot. I am able to change the textures fine but when I edit the bump map file no matter what RGB values I use or what format I save it in or what the different channels are set to they always come out with a blurry super high shine on them that I can't seem to control no matter what.

Can someone explain and easy way that I can edit the bump maps and have the end result look normal? I am something of a ludite and while I have the NVidia Texture Tools Exporter (stand alone) and GIMP I have am not very familiar with them as my normal painting is done in Paint Shop Pro with DXT format saving done in Paint.net. I use ModelConverterX to do rough cuts of my textures to line things up so am familiar with that.

Anyone able to explain it to me like I'm a caveman trying to land a space ship on the moon? See attached for what happens when I edit the bump map. The section above the wing has been edited to move the panel lines around the exit forward but now no matter what I do it is always blurry and the shading/shine doesn't match even though the COMP files are matched between the sections.

Thanks in advance,


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After a lot of trial and error, teeth mashing, fruitless google searching, and just plain old frustration I finally found a DDS format that makes them appear propperly. They don't compress as well and are twice the file size, but it looks right and that's what I was going for.