Here are some results for a few black & white images from https://commons.wikimedia.org/wiki/Category:PD-ScottForesman https://commons.wikimedia.org/wiki/Catego

Here are some results for a few black & white images from https://commons.wikimedia.org/wiki/Category:PD-ScottForesman https://commons.wikimedia.org/wiki/Category:PD-ScottForesman : (I only compare to JBIG2, not Group 4, since JBIG2 is supposed to be the best of those two) JBIG2 FLIF PNG 11690 10903 27093 1971_San_Jose_Scale_Scales_on_Branch 10458 9761 23466 1971_San_Jose_Scale_Winged_Adult 44809 44301 105555 Accommodation_ladder 15966 14882 44073 Aconite 27031 25877 59353 Adder 13569 13302 40317 Adenoids 36409 35058 84826 African_elephant 6890 6899 12982 Aft 24465 23170 51297 Agate_A-40 18969 17896 24261 Aisle 8612 8590 23408 Allen_wrench_and_screw 9968 9104 11792 Alpaca 12258 11952 36657 Alternately 196083 192611 254895 Amazon_River 76572 73529 105637 Arabian_Sea 275124 256820 311448 Archery_colored 139482 137329 162432 Argonne_Forest 40681 39952 70999 Astrolabe 24950 23317 32007 Brace 43808 41113 116671 Deer_2