Thank you Red Piotrus for including the credits that this doujin was scanned and cleaned by Colonel Paladin of The Black Squadron. It brings back a rush of fond nostalgia about one of the best of the old HCG ripping groups.
Those of you that were anime fans back in the 1990's or of USENET would remember the various members The Black Squadron. That group specialized in ripping HCG images (and other environmental pix too) out of the various hentai games. Unlike some other groups' picture sets, TBS sets were typically true rips and not screencaps. Various tools were created and passed out as well, thus helping other fans to rip other games that the TBS might not have (provided that the other games used the same image packing method).
Kilrathi must die!
@Red_Piotrus: >(different color on the cover?) Well, I assume that since Paladin had the doujin and scanned it along with touching it up, he would know if his scan had the correct color or not. Hopefully the scanner software settings were adjusted to give a final result that was as close to the doujin cover's actual color. That's fairly easy to do since preview images are available in every scanning software package I've ever used.