Reading ../oiio-images/dds/sample-DXT1.dds
../oiio-images/dds/sample-DXT1.dds :  123 x  456, 4 channel, uint8 dds
    SHA-1: D6525DC91F2020FB05EF4997BA1A3738955F5B76
    channel list: R, G, B, A
    compression: "DXT1"
    textureformat: "Plain Texture"
