Graeme Gill wrote: > lcms V2 is the same speed as qcms in the particular matrix-only mode > that they use (Marti optimised that path). What I should have also mentioned is that Argyll's IMDI pixel engine is very close to the same speed for 8 bit RGB->RGB with full cLUT transform using C code, as qcms and lcms using their special hand crafted x86 only assembler matrix transform only modes..... Graeme Gill.