S3 Texture Compression S3TC Format Comparison S3TC Format Comparison

| FOURCC | DX_10_Name | Description | Alpha_premultiplied | Compression_ratio | Texture_Type |
|---|---|---|---|---|---|
| DXT1 | BC1 | 1-bit Alpha / Opaque | N/A | 6:1(for 24 bit source image) | Simple non-alpha |
| DXT2 | (none) | Explicit alpha | Yes | 4:1 | Sharp alpha |
| DXT3 | BC2 | Explicit alpha | No | 4:1 | Sharp alpha |
| DXT4 | (none) | Interpolated alpha | Yes | 4:1 | Gradient alpha |
| DXT5 | BC3 | Interpolated alpha | No | 4:1 | Gradient alpha |