case 1:
		switch d.tmp[9] {
		case ctGrayscale:
			d.cb = cbG1
		case ctPaletted:
			d.cb = cbP1
		}
	case 2:
		switch d.tmp[9] {
		case ctGrayscale:
			d.cb = cbG2
		case ctPaletted:
			d.cb = cbP2
		}
	case 4:
		switch d.tmp[9] {
		case ctGrayscale:
			d.cb = cbG4
		case ctPaletted:
			d.cb = cbP4
		}
	case 8:
		switch d.tmp[9] {
		case 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
		e.tmp[9] = ctTrueColorAlpha
	case cbG16:
		e.tmp[8] = 16
		e.tmp[9] = ctGrayscale