Convert v2 to v1 [CAPT]

[traghav]

Hi!
Incredible tool, thanks for all the work you've been doing.
I have some CAPT print streams captured and want to convert it back to raster/png/anything readable
It's unfortunately CAPT v2 with HiSCOA encoding. From what I understand, this hasn't been reverse engineered yet?

Are there any ways I could get the original data? Maybe convert it back to v1 and use your decoder tool?
I tried to change the print processor, but it doesn't output anything other than capt v2.
Any other thing I could try?

Thanks

[mounaiban]

Happy new year, @traghav, and thanks for reaching out. The short answer: there is no way to convert between HiSCoA and SCoA, as they are very different codecs.

From my understanding of the underlying math, there is no conversion possible and a full decompression will be needed to switch between the two compression algorithms. FYI, HiSCoA is LZ77-like incorporating gamma-style coding and a state machine; meanwhile, SCoA combines simple RLE with delta coding.

A HiSCoA decoder will still be required.

Alexey has already reverse-engineered enough of HiSCoA to print from personal monochrome printers, especially the LBP2900, 3000, 3010, 3100 and 6000.