Subject: Re: [stella] My demo... From: "Eckhard Stolberg" <Eckhard_Stolberg@xxxxxx> Date: Tue, 29 May 2001 15:15:28 +0200 |
Thomas wrote: > For the different VCS colors we could try to do get as many samples as possible from different VCS. Just find some common games (like PacMan, Space Invaders, Pitfall!, ...) which nearly everybody owns and capture some screens which show many well known colours. > > Then it would be quite easy to define an "average" RGB-triple for each coloor. I think the colours in z26 are pretty acurate. But if someone can provide better RGB values from his TV capture card, we'll try to use them for improving the emulator. Quite some time ago I wrote a little program that showed all 128 colours on the screen when you pressed the joystick button. I think it's still available from Nick's website. Even though I used it back then to try out the PAL colours in PCAE, it would still work fine on a NTSC VCS. Gonzalo wrote: > Good idea... I can do it with two PAL-N 2600 (well, one is broken as I said > before) > > I have a question: If I make a PAL game, it will work on an NTSC system but > with colors changed and faster speed? or just won't work? I have the PELE > game (football, soccer) and I play it on my 2600 with a red background, so I > think it is an NTSC game... in emulators I see the background green > (obviously the right color), what is the problem? The speed comes from the number of scanlines that you do per frame. NTSC games usually do 262 lines per frame, which results in a rate of 60 frames per second. Games for the European PAL VCSs usually do 312 lines per frame, which gets you 50 frames per second. If you write a PAL game that does 50 frames per second, it will play at the same speed on any VCS, be it PAL, NTSC or SECAM. However you would probably have to adjust your NTSC TV in order to have the game syncronize to it. The colour palette is different on all three models of the VCS. So if you want to write a game, where the colours do matter, you would probably be better off writing special versions for each TV-standard. I don't know about PAL-N, but some South Americcan TV-standards only use the PAL colour encoding, but keep the resolution and frame rate from NTSC. You might have to take care of that, if you want to be able to play your game on your own VCS. BTW, z26 tries to detect the nessessary palette by counting the number of scanlines that a game does per frame. If a game does close to 262 lines, z26 will use the NTSC palette, and if a game does close to 312 lines, z26 will use the PAL palette. You need to keep that in mind when you are chosing the colours for your game on the emulator only. Manuel wrote: > I'm using Z26 colors too. They simply match with my TV colors. > Besides, when I had some colors selected for Gunfight on Z26 > it looked so crappy on StellaX that I never started it > there again :-) But the colours you are using in Gunfight are from the NTSC palette. You'd be surprised how crappy they'd look on your TV. ;-) Ciao, Eckhard Stolberg - Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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