switch e.cb {
	case cbG8:
		e.tmp[8] = 8
		e.tmp[9] = ctGrayscale
	case cbTC8:
		e.tmp[8] = 8
		e.tmp[9] = ctTrueColor
	case cbP8:
		e.tmp[8] = 8
		e.tmp[9] = ctPaletted
	case cbP4:
		e.tmp[8] = 4
		e.tmp[9] = ctPaletted
	case cbP2:
		e.tmp[8] = 2
		e.tmp[9] = ctPaletted
	case cbP1:
		e.tmp[8] = 1
		e.tmp[9] = ctPaletted
	case cbTCA8:
		e.tmp[8] = 8