# note: Entropy image referencing groups 0 and 900 only, leaving a 900-entry
#   hole.
# expect: ok
# exercises: num_htree_groups_max (901) exceeds the pixel count, so
#   ReadHuffmanCodes() builds the mapping[] remap and the 899 unused groups
#   take the "validate but do not store" branch.
lossless
width 8
height 4
meta_bits 2
meta_tiles 0 900