Convert bl1 to dds Online: bl12dds
You can use Tom's Editor to easily convert images from
DEGAS Elite block .BL1 to Direct Show Surface
Tom's Editor is a free, online image manipulation and converter program.
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DEGAS Elite block is an image format with extension BL1.
DDS are files invented by Microsoft to be used in games, mostly as textures. Images can be compressed to save space but the compression methods defined by DDS are all very fast in terms of coding and decoding.