When exporting my Model and importing it into another engine, It require an Image file as the texture instead of a MTL file, so I was just wondering how I would accomplish changing the mtl to and image file
A MTL file is just a material definition. It doesn't contain image data. See here for further (all) details about the MTL file format: http://paulbourke.net/dataformats/mtl/
If you're using OBJ files, you need three things:
- the model data as OBJ, contains vertices, faces, smoothing groups and texture coordinates, etc.
- the texture(s) (any image format, e.g. PNG)
- the material library file (which is referenced in your OBJ file)