KTX

KTX (Khronos Texture) is, according to its documentation, "a format for storing textures for OpenGL and OpenGL ES applications."

Identification
KTX files begin with a 12-byte signature:.

Specifications

 * KTX File Format Specification

Sample files

 * https://github.com/KhronosGroup/KTX/tree/master/testimages

Links

 * OpenGL ES SDK: KTX tool set
 * Khronos KTX Repository at GitHub