Kodi uses a tool named TexturePacker to compile all images used in a skin into a single file. The benefit
of it is that images inside the Textures.xbt will load faster in the skin. This is done by converting all
images into a format that take less processing by Kodi when they need to be rendered onto the screen.
A common misconception is that TexturPacker will just compress the images into a single file. This if far
from the truth, so don't be surprised if the Textures.xbt file is much larger than the total size of all
the individual images.
The optional -dupecheck option is useful if you have included the same image multiple times in your media
folder. For example, if your skin includes a lot of studio logos, most likely a lot of them are included
multiple times but with a slightly different filename. The '-dupecheck' option will make sure each unique
image is included only once in the Textures.xbt file, thus keeping the size of it as small as possible.