A DirectDraw Surface file (extension .dds’) is a Microsoft file format for storing compressed and uncompressed textures. Images saved in the DDS format can be compressed with greater efficiency and flexibility than, for example, of the BMP format that is considered its predecessor. The DDS format can remain compressed even after it is loaded into memory, unlike other image formats. This is useful for system performance. Another important feature is the support for alpha channels and for mipmapping. Mipmapping describes the level of detail that is a necessary consideration in terms of presenting your scene. A mipmap is a sequence of textures, each of which is a progressively lower resolution representation of the same image. Mipmapping improves the quality of rendered textures at the expense of using more memory. ImageConverter Plus allows converting images of a variety of graphic formats into the DDS format, and our users seem to really appreciate this option noticing that our software is really fast at doing this. When saving a file in the DDS format with the help of ImageConverter Plus (when the “Generate mip maps” option is selected) mipmaps are additional texture map sizes that are created. But you should note that to use the DDS format successfully with mipmap levels option, the size of the image you are saving should be equal to a power of two (128, 512, 1024 etc.). To fulfill this requirement, you can try various operations: crop, resize , canvas.