In addition to game textures needing to be saved as DDS files and properly formatted/compressed, three other things matter when replacing textures: size, proportion, and mipmaps.

To avoid problems, always be sure the modded texture shares the same alpha as the original. Improperly formatted alpha can lead to strange texture glitches in game. Texture alpha (transparency) is indicated by levels of gray. More on this in the summary table at the bottom of this article, but for now, here's a simple list of those used in all three games: It sticks to a small subset, and installments vary depending on the texture asset. The trilogy doesn't use every format and compression available. Texture data may include: RGB (color), alpha (transparency), palette (amount of colors available), luminance (light intensity), bump (surface texture), and more. The variety in DDS formats and compressions corresponds (in part) to the type of data being stored. It's due to this variation that textures for Mass Effect get very complicated, very quickly. DDS files are highly versatile, supporting compressed and uncompressed texture data that uses a variety of formats and algorithms. This format was introduced with DirectX 7.0 and has become the industry standard for use in DirexctX/Direct3D gaming applications. As discussed in An Intro to Mass Effect Mods, all three installments of the Mass Effect trilogy use Microsoft's Direct Draw Surface(DDS) format for textures.

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