Decompressing and recompressing the SArtfile is simple. The only things you need to make sure of is that any of the png resources you replace are 24-bit alpha channel with transparency (save for web in Photoshop, and select both 24-bit and transparency, then save) and that your original SArtFile.bin is the same directory as the art tools when you recompress.
SArtFile is used a bit even when CoreUI is disabled (window frames, for instance)...
Sartfiles are simple to be decompressed because we have the tool already compiled, and also used even when coreui is disabled,like you said.
Yesterday after a bit of research i figured out that we need to replace
Artfile.bin, not SARTFILE.BIN.
That was a problem because the tool provided in
GitHUB wasn't compiled, so wouldn't be that simple. All the UI images are inside Artfile.bin, that explains what happend when i replaced the extras.rsrc files and
disabled CoreUI via terminal, and yosemite the traffic lights appeared ( the command knocked out Artfile.bin and the system used extras rsrc file instead, just like Tiger used to).
So, Artfile.bin differs from Sartfile.bin and isn't used when coreui is disabled.
If we want something better we must Replace Artfile.bin, it must be decompressed with a different tool from the one used in Sartfile.bin and the tool was nowhere to be found Compiled. But after a long time searching it i found it.
[doublepost=1477758321][/doublepost]Its all a matter of patience now.
Download the tool
here
With this tool we wont need to disable coreUI with that terminal command.
Backup Artfile.bin
Copy Artfile.bin to a new folder in desktop
rename it Artfile.original.bin
Copy artFileTool.jar to that folder
Open terminal
type cd and drag the folder, hit enter
type in
java -jar artFileTool.jar -decode ArtFile.original.bin artFiles
All the files will be decoded.
Now, open photoshop and edit file resizing each of the yosemite core pngs so that they fit in leopards.
After doing so, encode back the Bin.
java -jar artFileTool.jar -encode artFiles ArtFile.original.bin ArtFile.bin
Replace the file in system folder now.
Killall Finder
I did a little test with the tool but did not resize the files, just to see if the traffic lights would be replaced.