There is only one file type that uses the .TNE extension:
Manga Studio Tone File
A TNE file is a graphic file used by Manga Studio, an application used for creating comic books. It stores a pattern that can texturize a fill area, such as clothing, shadows, hair, or other drawn objects. TNE files can be applied to a Tone layer in a Manga drawing.
Tones often look like the dotted background commonly seen in comics. They are used to add depth and illustrate the direction of light.
NOTE: Manga Studio became Clip Studio Paint in 2015. It is also known as ComicStudio in Japan.
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Updated: August 28, 2018