The texture loader in GL.IO was around 15 years old and supported only the Targa (.tga) format for textures, plus a few sub-formats of Windows bitmaps (.bmp).
In order to make things easy when dealing with various models, e.g. those imported from Blender, the old code for reading images has been wiped out and the loader is using now GID for the job, supporting JPEG or PNG in addition. For instance the Blender model below is using the JPEG format for textures.
|Futuristic Combat Jet (hi poly version) by Dennis Haupt (DennisH2010)|
The following Blender model has a single PNG texture projected on a complicated surface called a Mandelbulb (never heard of before!) :
|Mandelbulb 3D Panorama 3 by DennisH2010|