Pascal de Bruijn wrote: > Doing some experiments, it seems when generating matrix only profiles > using argyll 1.5.1, a non-linear gamma is being inserted, effectively > making -a m an alias for -a G... Yes, this is a bug introduced in V1.5. Fix is change line 892 of xicc/xmatrix.c from if (!isLinear || isGamma) { to if (!isLinear) { Graeme Gill.