This format is used to store a 4 bits per pixel (4bpp) image, with each bit on a specific plane. The most significant (MSB) bit of each pixel is located in the first plane, the next bit in the next plane... and the less significant bit is located on the last plane. Consequently, we found 4 planes, i.e. 4 parts in the source data. Decoded pixels begin from the top left corner of the image and end to the bottom right corner. A pixel here is a color index from the corresponding palette (16 colors). input = list of bytes
for each plane
  for each pixels
    index of input byte to read = current pixel index / 8 + input bytes already read from previous planes
    bit index to extract in this input byte = MSB to LSB
    use read bit as bit "current plane index" of current pixel
input = list of bytes
NbrOfPlanes = 4
for each plane Pli (0 -> NbrOfPlanes - 1)
  for each pixels Pxi (0 -> trunc(input.size / NbrOfPlanes * 8) - 1)
    input_index = trunc(Pxi / 8) + Pli*trunc(input.size / NbrOfPlanes)
    bit_index = (8-1) - Pxi modulo 8
    Bit Pli of pixels Pxi = bit bit_index of input input_index
  byte[] pData = ...
  int lNbrOfPlanes = 4;
  int lPlaneSize = pData.length / lNbrOfPlanes;
  int lNbrOfPixels = lPlaneSize * 8;
  byte[] lPixels = new byte[lNbrOfPixels];
  for (int lPli = 0; lPli < lNbrOfPlanes; lPli++) {
    for (int lPxi = 0; lPxi < lNbrOfPixels; lPxi++) {
    int lInputIndex = lPxi / 8 + lPli*lPlaneSize;
    int lBitIndex = (8-1) - lPxi % 8;
    lPixels[lPxi] |= (byte)((((pData[lInputIndex] >>> lBitIndex) & 0x1) << lPli) & (int)Math.pow(2, lPli));
  }
}