Texture Assembler - is a tool for quick and easy manipulation of RGBA image channels. For example, it can be used to convert textures between different engines. It can:

• Pack different images into single image channels.
  
• Split image channels into separate images.
  It can also process a large batch of images with a single click.
  
• Pack textures in bulk and also create your own templates.
  

Supported formats. TGA, BMP, TIFF, JPEG, PNG.