Index Tag Name Writable Values / Notes 4 ImageWidth N 8 ImageHeight N 12 Planes N 14 BitDepth N 16 Compression N 0 = None
1 = 8-Bit RLE
2 = 4-Bit RLE
3 = Bitfields20 ImageLength N 24 PixelsPerMeterX N 28 PixelsPerMeterY N 32 NumColors N 36 NumImportantColors N