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Editing colour pallettes
RedAngel - Feb 21, 2006
  RedAngel Feb 21, 2006
Several Genny games have horrible colours that I would like to change. I am using Gens Kmod to extract a bin with the cram and then I try to find the values in the rom with Hexpose. I can´t find where the colour pallettes are... Could someone help me?

 Kaneda Feb 21, 2006
use the "special DMA feature" in KMod and look where the CRAM is filled...

but you'll be able to do that only if colors isn't compressed

 RedAngel Feb 21, 2006
I will try what you said. Thanks Kaneda .

 RedAngel Feb 21, 2006
I have tried several games and I got things like "VRAM of 3 bytes from FFF908 to 0024 CRAM", but this talks about the video memory and not the rom, isn´t it? I need to know the place in the rom where the colour values are stored. Some guys are doing something similar with NHL94 but they only say where the colour values are and not how to find them.

 LocalH Feb 21, 2006
That appears to be moving values from 68k RAM to CRAM. So, you need to look for code that places values into RAM $F908 to find out where the game gets those values from.

 RedAngel Feb 25, 2006
I am afraid I don´t know enough things to do what I want. The pallettes may be compressed and then it is harder than simply changing "0CCC" to "0CCE". Anyway, thanks for your replies :cheers .

 RedAngel Mar 17, 2006
I was able to do it :banana . It was as easy as changing "0EEE" to "0ECC" in a hex editor. The real problem was to find the ofsets where the colour values were stored. You only have to take an screenshot with an emulator and write four or five colours (in the Megadrive format) of a sprite, background... on a piece of paper and then look for those values in a hex editor. Remember that the format is 0BGR not RGB.

Table

Megadrive Pc RGB

0 0

2 32

4 64

6 96

8 128

A 160

C 192

E 224

I know that Gens Kmod have an option to see the pallettes and tiles, you can even take a screenshot but they have wrong values even changing the contrast to 90 (please Kaneda fix this). Then it would be even easier to find the right pallettes.

PD: I am changing the colours of a very popular game with great (it´s my opinion) results, when I have more changes made I will release a modified rom or an ips for you to see .

 LocalH Mar 17, 2006
Yeah, some people like to expand $0EEE to $FFFFFF, and some people prefer not to stretch the values, leaving $0EEE at $E0E0E0. I am the latter type of person.

 Kaneda Mar 17, 2006
what what what ?

which pal problem ?!!!

tell me tell me!

 RedAngel Mar 19, 2006

  
	
	

		
		

			Originally posted by Kaneda@Fri, 2006-03-17 @ 07:09 PM



what what what ?



which pal problem ?!!!



tell me tell me!




[post=145152]Quoted post[/post]


If you do not change contrast to 90 in Gens you get brighter colours than the real ones (e.g. 248,255,248 instead of 224,224,224). In debug/VDP you can see all the pallettes and tiles, if you take a screenshot and you look at all those colours they are still brighter than they should (even changing the contrast).

 RedAngel Apr 22, 2006
I have started a new project in Eidolon´s Inn: Colour Hacking Zone...

By the way, Kaneda, please change the colour values, not in the emulator but in the window of the CPU/DEBUG/VDP.

 RedAngel Apr 25, 2006
First versions of Golden Axe and Castlevania .ips files released!

Grab them here Colour hacked games...

 RedAngel May 23, 2006
New Castlevania patch released!