Iv'e seen little amounts of guides on the form so i want to help out.
Tools you will need for Bo2 camo's:
Grayhound: https://github.com/Scobalula/Greyhound/releases/download/1.23.31.0/Greyhound.V.1.23.31.0-release.zip
Paint .net:
https://www.dotpdn.com/downloads/pdn.html
IWI & DDS converter:
https://www.itsmods.com/forum/Thread-Release-IWI-DDS-Fast-Converter-V1-40.html
side note: you need winwar or 7zip i use winwar so this guide will be with winwar.
Step 1
Make a folder with all the tools and then extract the tools.
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now all you have to do is install paint .net.
step 2
To get the textures you are going to want to open GreyHound, then you are going to want to settings and check the boxes.
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now you want to open the game you want the textures from (in my case black ops 2) once your game is open load into a map of your choice, once you are in a map go to grayhound again and click load game.
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now you find the texture you want in my case it's weapons then you export them.
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now you want to go to the folder you installed grayhound in and look for a folder called exported files in there you will have all the files you exported includeding textures let me show you.
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step 3
This is where the fun begins, take those textures you just exported and open them in paint .net then you can design your skin/camo.
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When you are done save the file as a DDS file then take it to the IWI/DDS converter and make sure you type the right number for the game you want.
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step 4
To install your skin on pluto t6 go to your C:\Users(your windows user)\AppData\Local\Plutonium\storage\t6\images and drag your IWI folder in the images folder if you don't have one make one let me show you me testing my example camo.!
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If you guys need leave a comment and i will get back to you when i am not busy for now have a great day i hope this helps.