[A83] Re: Grey scale(and enterlacing, is that the right wordfor it?)
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[A83] Re: Grey scale(and enterlacing, is that the right wordfor it?)
On Mon, 31 Dec 2001, Gavin Olson wrote:
>
> At 06:22 PM 12/31/01 +0100, you wrote:
>
> > > 8 level is only three buffers:
> > >
> > > 000 - White
> > > 001 - Grey1
> > > 010 - Grey2
> > > 100 - Grey3
> > > 011 - Grey4
> > > 101 - Grey5
> > > 110 - Grey6
> > > 111 - Black
> >
> >Okay, but these three buffers need to be displayed
> >for seven frames altogether to create one greyscale
> >frame.
> >
> >PG
>
> No . . . you display buffer one for x ticks, buffer two for 2x ticks, and
> buffer three for 3x ticks, and restart.
If you do that, however, you can not get 8 different colors, but only 7.
If a pixel is set in buffers one and two only, it will be shows as set 3x
ticks out of every 6x. Likewise, a pixel set in buffer three only will be
shown for every 3x ticks out of 6x. Those two amount seem remarkably
similar to me.
This problem would go away if buffer three is shown for 4x ticks instead.
However, if 'x ticks' happens to be less than an entire hardware frame,
then some of the data won't be shown at all.
References: