You can extract images on some games, but they are missing the names to be used as replacements. so the only way is to finish the game, but cheats help alot to finish sooner. i sometimes rip images from pc versions if they are of higher quality, upscale them even further and replace the PS2 dumps. I'm almost done with my Dredd Vs Death texture pack that I did from the pc version, but took a while to rename all the images.
There is a software, but again, it's useless because the textures will not have the same filenames as the texture dumps. So if you extract textures from the .iso and put them in replacements folder, none of them would load without the filenames which you don't know until you dump all the textures via pcsx2. That's why i had to dump all the textures from the Dred vs Death game so I could rename the higher resolution pc ones in order to work with pcsx2.
