#SNG: from ftbbn3p08.png
IHDR {
    width: 32; height: 32; bitdepth: 8;
    using color palette;
}
gAMA {1.0000}
PLTE {
    (255,255,255)     # rgb = (0xff,0xff,0xff) grey100
    (128, 86, 86)     # rgb = (0x80,0x56,0x56)
    (181,181,184)     # rgb = (0xb5,0xb5,0xb8)
    (168, 66, 66)     # rgb = (0xa8,0x42,0x42)
    (159,159,159)     # rgb = (0x9f,0x9f,0x9f)
    (177, 32, 32)     # rgb = (0xb1,0x20,0x20)

#SNG: from basn3p08-trns.png
IHDR {
    width: 32; height: 32; bitdepth: 8;
    using color palette;
}
gAMA {1.0000}
PLTE {
    (255,  3,  7)     # rgb = (0xff,0x03,0x07)
    (255,  4,  7)     # rgb = (0xff,0x04,0x07)
    (255,  9,  7)     # rgb = (0xff,0x09,0x07)
    (217, 14,  7)     # rgb = (0xd9,0x0e,0x07)
    (255, 14,  7)     # rgb = (0xff,0x0e,0x07)
    (  2, 22, 19)     # rgb = (0x02,0x16,0x13)
    (255, 26,  7)     # rgb = (0xff,0x1a,0x07)

		}

		piper, pipew := io.Pipe()
		pb := bufio.NewScanner(piper)
		go sng(pipew, fn, img)
		defer piper.Close()

		// Read the .sng file.
		sf, err := os.Open("testdata/pngsuite/" + fn + ".sng")
		if err != nil {
			t.Error(fn, err)
			continue
		}
		defer sf.Close()
		sb := bufio.NewScanner(sf)

		// Compare the two, in SNG format, line by line.
		for {
			pdone := !pb.Scan()
			sdone := !sb.Scan()