Subject: Re: [stella] NTSC - PAL porting guide From: Nick S Bensema <nickb@xxxxxxxxxxxx> Date: Sat, 8 Mar 1997 15:48:54 -0700 (MST) |
> > > >On Sat, 8 Mar 1997, Eckhard Stolberg wrote: >> NTSC PAL >> >> grey grey > >It would be useful to establish actual RGB values for 2600 output instead >of just names. I realize that these are the 16 hue values available. You >won't be able to establish true RGB values just by grabbing screens >because the 2600 may be slightly off its center calibration and going from >RF or composite to RGB results in unpredictable results. > >But it could be calculated mathematically. If you establish that there >are 16 hues, and 8 luminances per hue, then you should be able to convert >HSV to RGB to get at the internal values the 2600 is attempting to >generate. I could probably do it if noone else wanted to. Huh? Uh, WHY? I'm just interested in which value makes a good yellow, or a good blue. There's not much else to it. The truth about Atari hue-luminance video is that the luminance controls saturation, not brilliance. $20 makes a deep red, which could easily fade to white by incrementing to $2E and shifting to $0E. But you cannot fade to black from it. We must also consider that PAL is a much more delicate format than NTSC. I never would have dreamed that if the vertical blank time were off, the color would be out of whack or missing, but apparently it is true. Also witness the apparent color differences in PAL versions of Supercharger games. -- To unsubscribe, send the word UNSUBSCRIBE in the body of a message to stella-request@xxxxxxxxxxx
Current Thread |
---|
|
<- Previous | Index | Next -> |
---|---|---|
Re: [stella] NTSC - PAL porting gui, Glenn Saunders | Thread | [stella] RGB monitor colors vs. Com, Glenn Saunders |
Re: [stella] Crackers' Easy Playfie, Nick S Bensema | Date | Re: [stella] Table of Note Values?, Glenn Saunders |
Month |