I do understand that you want to improve the image quality of SR2 but I did ask you a question, "What type of grime texture you're trying to make and what color? I may be able to help" , but you haven't answered me. Anyway, you are doing a great job with the HQ Texture pack and I could help you make that grime texture I asked you about. Did you know why I darkened them pavement and roads? That was my idea to make the game look more beautiful since SR1 and SR2 don't have them roads and pavements like that
I was going to reply separately for grime texture.
I can take very long to write an English sentence. Please be patient about it.
The grime texture I need is high-resolution than the original.
I research about the creation of grime texture too.