image/bpg has been suggested for the MIME type, but none is formally registered.
BPG files start with the following 4-byte magic pattern:
42 50 47 fb.
- Comparison with JPEG (actual BPG files: lena_q36.bpg, lena_q32.bpg, lena_q28.bpg, lena_q23.bpg)
- Wikipedia pictures (actual BPG files: 003.bpg,005.bpg)
- Images with alpha channel (actual BPG files: 2.bpg,2small.bpg, 3.bpg, 5.bpg)