I'm interested in unpacking the game CGs/images of "Yu-no - The Girl who chants Love at the Bound of this World" Sega Saturn port. Back when TLwiki translated the game on PC, they had tools to get the Saturn images, but unfortunately, they never made them public.
Why am I interested in this? I'd like to look at the CGs and then possibly use them for a small project
I think the Saturn images look really nice and colorful compared to the other ports of this game: https://imgur.com/a/r99wjsK̶T̶h̶e̶ ̶t̶e̶c̶h̶n̶i̶c̶a̶l̶ ̶a̶s̶p̶e̶c̶t̶s̶:̶
̶-̶T̶h̶e̶ ̶g̶r̶a̶p̶h̶i̶c̶s̶ ̶a̶r̶e̶ ̶i̶n̶ ̶a̶ ̶3̶2̶M̶B̶ ̶a̶r̶c̶h̶i̶v̶e̶ ̶(̶G̶R̶A̶P̶H̶.̶A̶B̶L̶)̶ ̶w̶i̶t̶h̶ ̶a̶n̶ ̶e̶x̶t̶e̶n̶s̶i̶o̶n̶ ̶.̶A̶B̶L̶.̶ ̶M̶a̶g̶i̶c̶ ̶i̶n̶s̶i̶d̶e̶ ̶t̶h̶e̶ ̶f̶i̶l̶e̶ ̶s̶a̶y̶s̶ ̶"̶A̶B̶L̶I̶N̶K̶"̶.̶
̶-̶T̶h̶e̶ ̶h̶e̶a̶d̶e̶r̶ ̶i̶s̶ ̶1̶2̶ ̶b̶y̶t̶e̶s̶.̶ ̶6̶ ̶o̶f̶ ̶t̶h̶o̶s̶e̶ ̶b̶y̶t̶e̶s̶ ̶b̶e̶l̶o̶n̶g̶ ̶t̶o̶ ̶m̶a̶g̶i̶c̶,̶ ̶w̶h̶i̶l̶e̶ ̶6̶ ̶o̶t̶h̶e̶r̶ ̶b̶y̶t̶e̶s̶ ̶I̶ ̶d̶o̶n̶'̶t̶ ̶k̶n̶o̶w̶
̶-̶A̶f̶t̶e̶r̶ ̶t̶h̶e̶ ̶h̶e̶a̶d̶e̶r̶,̶ ̶I̶'̶v̶e̶ ̶f̶o̶u̶n̶d̶ ̶t̶h̶a̶t̶ ̶t̶h̶e̶r̶e̶ ̶a̶r̶e̶ ̶f̶i̶l̶e̶n̶a̶m̶e̶ ̶l̶a̶b̶e̶l̶s̶,̶ ̶t̶h̶a̶t̶ ̶a̶r̶e̶ ̶e̶a̶c̶h̶ ̶1̶2̶ ̶b̶y̶t̶e̶s̶ ̶l̶o̶n̶g̶.̶ ̶O̶f̶ ̶t̶h̶o̶s̶e̶ ̶1̶2̶ ̶b̶y̶t̶e̶s̶:̶
̶ ̶ ̶ ̶ ̶*̶ ̶2̶ ̶b̶y̶t̶e̶s̶ ̶-̶ ̶?̶?̶
̶ ̶ ̶ ̶ ̶*̶ ̶2̶ ̶b̶y̶t̶e̶s̶ ̶-̶ ̶i̶n̶d̶i̶c̶a̶t̶e̶s̶ ̶s̶o̶m̶e̶ ̶g̶r̶o̶w̶i̶n̶g̶ ̶n̶u̶m̶b̶e̶r̶,̶ ̶b̶u̶t̶ ̶t̶h̶e̶r̶e̶ ̶i̶s̶n̶'̶t̶ ̶a̶n̶y̶ ̶c̶o̶n̶s̶i̶s̶t̶e̶n̶c̶y̶ ̶t̶o̶ ̶i̶t̶.̶
̶ ̶ ̶ ̶ ̶*̶ ̶8̶ ̶b̶y̶t̶e̶s̶ ̶-̶ ̶f̶i̶l̶e̶n̶a̶m̶e̶,̶ ̶t̶h̶a̶t̶'̶s̶ ̶n̶u̶l̶l̶ ̶t̶e̶r̶m̶i̶n̶a̶t̶e̶d̶ ̶(̶i̶n̶ ̶o̶t̶h̶e̶r̶ ̶w̶o̶r̶d̶s̶,̶ ̶f̶i̶l̶e̶n̶a̶m̶e̶ ̶c̶a̶n̶ ̶b̶e̶ ̶u̶p̶ ̶t̶o̶ ̶8̶ ̶b̶y̶t̶e̶s̶ ̶l̶o̶n̶g̶)̶
̶-̶I̶ ̶a̶l̶s̶o̶ ̶s̶u̶s̶p̶e̶c̶t̶ ̶t̶h̶e̶r̶e̶'̶s̶ ̶s̶o̶m̶e̶ ̶c̶o̶m̶p̶r̶e̶s̶s̶i̶o̶n̶ ̶a̶l̶g̶o̶r̶i̶t̶h̶m̶ ̶i̶n̶v̶o̶l̶v̶e̶d̶
̶I̶'̶m̶ ̶s̶t̶i̶l̶l̶ ̶a̶ ̶b̶i̶g̶ ̶n̶o̶o̶b̶ ̶i̶n̶ ̶R̶e̶v̶e̶r̶s̶e̶ ̶E̶n̶g̶i̶n̶e̶e̶r̶i̶n̶g̶,̶ ̶s̶o̶ ̶m̶y̶ ̶g̶u̶e̶s̶s̶e̶s̶ ̶a̶b̶o̶u̶t̶ ̶t̶h̶e̶ ̶s̶t̶r̶u̶c̶t̶u̶r̶e̶ ̶m̶a̶y̶ ̶b̶e̶ ̶i̶n̶c̶o̶r̶r̶e̶c̶t̶ ̶(̶w̶h̶i̶c̶h̶ ̶i̶s̶ ̶w̶h̶y̶ ̶I̶'̶m̶ ̶a̶s̶k̶i̶n̶g̶ ̶h̶e̶r̶e̶ ̶f̶o̶r̶ ̶s̶o̶m̶e̶ ̶h̶e̶l̶p̶ ̶:̶)̶ ̶I̶ ̶w̶a̶s̶ ̶a̶b̶l̶e̶ ̶t̶o̶,̶ ̶h̶o̶w̶e̶v̶e̶r̶,̶ ̶e̶x̶t̶r̶a̶c̶t̶ ̶a̶l̶l̶ ̶t̶h̶e̶ ̶f̶i̶l̶e̶n̶a̶m̶e̶s̶ ̶i̶n̶ ̶t̶h̶e̶ ̶a̶r̶c̶h̶i̶v̶e̶ ̶u̶s̶i̶n̶g̶ ̶a̶ ̶p̶y̶t̶h̶o̶n̶ ̶s̶c̶r̶i̶p̶t̶.̶
̶
̶A̶l̶s̶o̶,̶ ̶e̶x̶t̶r̶a̶c̶t̶i̶n̶g̶ ̶i̶m̶a̶g̶e̶s̶ ̶o̶u̶t̶ ̶o̶f̶ ̶t̶h̶e̶ ̶r̶e̶s̶u̶l̶t̶i̶n̶g̶ ̶f̶i̶l̶e̶s̶ ̶i̶n̶ ̶t̶h̶e̶ ̶a̶r̶c̶h̶i̶v̶e̶ ̶s̶h̶o̶u̶l̶d̶n̶'̶t̶ ̶b̶e̶ ̶a̶ ̶p̶r̶o̶b̶l̶e̶m̶,̶ ̶a̶s̶ ̶I̶ ̶f̶o̶u̶n̶d̶ ̶a̶t̶ ̶l̶e̶a̶s̶t̶ ̶o̶n̶e̶ ̶o̶r̶ ̶t̶w̶o̶ ̶S̶e̶g̶a̶ ̶S̶a̶t̶u̶r̶n̶ ̶i̶m̶a̶g̶e̶ ̶e̶x̶t̶r̶a̶c̶t̶o̶r̶s̶ ̶o̶n̶ ̶G̶o̶o̶g̶l̶e̶.̶
̶
̶U̶P̶D̶A̶T̶E̶:̶
̶T̶h̶e̶ ̶t̶e̶c̶h̶n̶i̶c̶a̶l̶ ̶a̶s̶p̶e̶c̶t̶s̶:̶
̶
̶T̶h̶e̶ ̶b̶y̶t̶e̶ ̶o̶r̶d̶e̶r̶ ̶i̶s̶ ̶B̶I̶G̶ ̶E̶N̶D̶I̶A̶N̶
̶
̶-̶T̶h̶e̶ ̶g̶r̶a̶p̶h̶i̶c̶s̶ ̶a̶r̶e̶ ̶i̶n̶ ̶a̶ ̶3̶2̶M̶B̶ ̶a̶r̶c̶h̶i̶v̶e̶ ̶(̶G̶R̶A̶P̶H̶.̶A̶B̶L̶)̶ ̶w̶i̶t̶h̶ ̶a̶n̶ ̶e̶x̶t̶e̶n̶s̶i̶o̶n̶ ̶.̶A̶B̶L̶.̶ ̶
̶-̶T̶h̶e̶ ̶h̶e̶a̶d̶e̶r̶ ̶i̶s̶ ̶1̶6̶ ̶b̶y̶t̶e̶s̶:̶
̶ ̶ ̶ ̶ ̶*̶ ̶6̶ ̶b̶y̶t̶e̶s̶ ̶-̶ ̶M̶a̶g̶i̶c̶ ̶(̶c̶a̶l̶l̶e̶d̶ ̶"̶A̶B̶L̶I̶N̶K̶"̶)̶
̶ ̶ ̶ ̶ ̶*̶ ̶2̶ ̶b̶y̶t̶e̶s̶ ̶-̶ ̶?̶?̶?̶
̶ ̶ ̶ ̶ ̶*̶ ̶4̶ ̶b̶y̶t̶e̶s̶ ̶-̶ ̶S̶o̶m̶e̶t̶h̶i̶n̶g̶ ̶r̶e̶l̶a̶t̶e̶d̶ ̶t̶o̶ ̶f̶i̶l̶e̶ ̶s̶i̶z̶e̶,̶ ̶a̶s̶ ̶t̶h̶e̶ ̶v̶a̶l̶u̶e̶ ̶i̶s̶ ̶q̶u̶i̶t̶e̶ ̶c̶l̶o̶s̶e̶ ̶t̶o̶ ̶3̶2̶M̶B̶ ̶-̶ ̶H̶e̶x̶ ̶v̶a̶l̶u̶e̶ ̶i̶s̶ ̶0̶x̶0̶1̶D̶A̶6̶B̶5̶2̶,̶ ̶t̶h̶a̶t̶'̶s̶ ̶3̶1̶0̶9̶1̶5̶3̶8̶ ̶i̶n̶ ̶d̶e̶c̶i̶m̶a̶l̶,̶ ̶o̶r̶ ̶r̶o̶u̶g̶h̶l̶y̶ ̶3̶1̶ ̶M̶B̶.̶
̶ ̶ ̶ ̶ ̶*̶ ̶4̶ ̶b̶y̶t̶e̶s̶ ̶-̶ ̶F̶i̶l̶e̶ ̶c̶o̶u̶n̶t̶ ̶-̶ ̶1̶5̶8̶7̶ ̶i̶n̶ ̶t̶h̶i̶s̶ ̶s̶a̶m̶p̶l̶e̶'̶s̶ ̶c̶a̶s̶e̶
̶
̶-̶A̶f̶t̶e̶r̶ ̶t̶h̶e̶ ̶h̶e̶a̶d̶e̶r̶,̶ ̶I̶'̶v̶e̶ ̶f̶o̶u̶n̶d̶ ̶t̶h̶a̶t̶ ̶t̶h̶e̶r̶e̶ ̶a̶r̶e̶ ̶f̶i̶l̶e̶n̶a̶m̶e̶ ̶l̶a̶b̶e̶l̶s̶,̶ ̶t̶h̶a̶t̶ ̶a̶r̶e̶ ̶e̶a̶c̶h̶ ̶1̶2̶ ̶b̶y̶t̶e̶s̶ ̶l̶o̶n̶g̶.̶ ̶ ̶O̶f̶ ̶t̶h̶o̶s̶e̶ ̶1̶2̶ ̶b̶y̶t̶e̶s̶:̶ ̶
̶ ̶ ̶ ̶ ̶*̶ ̶8̶ ̶b̶y̶t̶e̶s̶ ̶-̶ ̶f̶i̶l̶e̶n̶a̶m̶e̶,̶ ̶t̶h̶a̶t̶'̶s̶ ̶n̶u̶l̶l̶ ̶t̶e̶r̶m̶i̶n̶a̶t̶e̶d̶ ̶(̶i̶n̶ ̶o̶t̶h̶e̶r̶ ̶w̶o̶r̶d̶s̶,̶ ̶f̶i̶l̶e̶n̶a̶m̶e̶ ̶c̶a̶n̶ ̶b̶e̶ ̶u̶p̶ ̶t̶o̶ ̶8̶ ̶b̶y̶t̶e̶s̶ ̶l̶o̶n̶g̶)̶
̶ ̶ ̶ ̶ ̶*̶ ̶2̶ ̶b̶y̶t̶e̶s̶ ̶-̶ ̶A̶ ̶n̶u̶m̶b̶e̶r̶ ̶t̶h̶a̶t̶'̶s̶ ̶e̶i̶t̶h̶e̶r̶ ̶2̶5̶6̶,̶ ̶1̶0̶2̶4̶ ̶o̶r̶ ̶2̶8̶1̶6̶ ̶(̶r̶e̶s̶p̶e̶c̶t̶i̶v̶e̶l̶y̶ ̶0̶x̶0̶1̶0̶0̶,̶ ̶0̶x̶0̶4̶0̶0̶ ̶o̶r̶ ̶0̶x̶0̶B̶0̶0̶)̶ ̶(̶i̶m̶a̶g̶e̶ ̶s̶i̶z̶e̶?̶?̶)̶
̶ ̶ ̶ ̶ ̶*̶ ̶2̶ ̶b̶y̶t̶e̶s̶ ̶-̶ ̶i̶n̶d̶i̶c̶a̶t̶e̶s̶ ̶s̶o̶m̶e̶ ̶g̶r̶o̶w̶i̶n̶g̶ ̶n̶u̶m̶b̶e̶r̶,̶ ̶b̶u̶t̶ ̶I̶ ̶c̶o̶u̶l̶d̶n̶'̶t̶ ̶f̶i̶n̶d̶ ̶a̶n̶y̶ ̶c̶o̶n̶s̶i̶s̶t̶e̶n̶c̶y̶ ̶t̶o̶ ̶i̶t̶ ̶(̶f̶i̶r̶s̶t̶ ̶5̶ ̶n̶u̶m̶b̶e̶r̶s̶,̶ ̶f̶o̶r̶ ̶e̶x̶a̶m̶p̶l̶e̶,̶ ̶a̶r̶e̶ ̶1̶0̶,̶ ̶2̶5̶,̶ ̶4̶3̶,̶ ̶5̶4̶,̶ ̶7̶2̶,̶ ̶e̶t̶c̶.̶)̶
̶
̶T̶h̶i̶s̶ ̶r̶e̶p̶e̶a̶t̶s̶ ̶1̶5̶8̶8̶ ̶t̶i̶m̶e̶s̶ ̶(̶l̶a̶s̶t̶ ̶f̶i̶l̶e̶n̶a̶m̶e̶ ̶i̶s̶ ̶j̶u̶s̶t̶ ̶p̶a̶d̶d̶i̶n̶g̶?̶)̶
̶ ̶ ̶ ̶ ̶
̶-̶I̶'̶m̶ ̶9̶9̶%̶ ̶s̶u̶r̶e̶ ̶t̶h̶e̶r̶e̶'̶s̶ ̶a̶ ̶c̶o̶m̶p̶r̶e̶s̶s̶i̶o̶n̶ ̶a̶l̶g̶o̶r̶i̶t̶h̶m̶ ̶i̶n̶v̶o̶l̶v̶e̶d̶
UPDATE 2:
I was able to create an unpacker for the image files. The image format, sadly, is unknown. I can't seem to extract those in any way at the moment. But at least the unpacker works. More technical details on Github: https://github.com/Spazzery/yu-no-sega-saturn-unpacker
It also looks like there was no compression algorithm involved after all.
Link to the GRAPH.ABL file: https://www.mediafire.com/file/q7ghoq2m ... H.ABL/file
Now I'd need help extracting those image files
Link to first file that I got from the unpacker: https://www.mediafire.com/file/13bpzib0 ... BZABG/file.
Any help/info is appreciated