1/537 refit decals

[cannon fodder]

OK so when I'm done with my contest entry I plan on going back to my 1/537 special edition refit and have a plan for the decals. I downloaded the starship modeler Aztec decals and want to.modify them using a custom color scheme but they come up as a JPEG file. Paint won't let me modify it. Does someone in the know have any idea what program I need to accomplish this?

[MEATLOAFr]

I use Corel Draw, but alot of people use Adobe Illustrator

Inkscape illustrator (vector illustrator)
https://www.inkscape.org/en/
MyPaint
https://mypaint.intilinux.com/
Artweaver
https://www.artweaver.de/home-en/
Pixarra : TwistedBrush (free version)
https://www.pixarra.com/
Pixia
https://www.ne.jp/asahi/mighty/knight/
D-pixed
https://honorless.net/shibai/downloads/
Rendera - Free Graphic Editor
https://www.rendera.net/




Any vector style graphic program will work fine