1. A method of decompressing texel color information, said method comprising: accessing data comprising an encoded version of sets of color component values for a block of texels, said encoded version comprising a first set of color component values selected from a pre-encoded version of said sets and a second set of color component values selected from said pre-encoded version of said sets, wherein said first set and said second set correspond to endpoints of a range of colors and wherein said encoded version further comprises a plurality of index values associated with said texels; and using said first set and said second set and an index value associated with a texel to decode a third set of color component values that describes a color for said texel, wherein said index value indicates how to determine said third set using said first set and said second set.