Mitch Crane wrote:
> "Michael Linford" <mlinford229d@comcast.net> wrote in
> news:nJGdnWfRRfU33_TYnZ2dnUVZ_o-dnZ2d@comcast.com:

> > I have a two year old laptop with a video card problem. It doesn't
> > display reds, either on the LCD screen or an external monitor. I
> > have tried cleaning the contacts, still no luck. It is out of
> > warranty and the price of parts is pretty high, so I've decided to
> > buy a new laptop. But I would like to keep this one around as a
> > backup since it still works fine other than the video card. I think
> > I could tolerate it if I disabled the greens and blues as well and
> > essentially turn it into a grayscale display. Would this even work,
> > and if so how would I do it?

> Without red there is just no way to achieve gray. Grayscale would be
> achieved on an RGB system by setting the red, green and blue to equal
> values in the pixels, so you could, for example achieve 256 levels of
> gray by using RGB vlaues 0,0,0 though 255,255,255 with 24-bit color. If
> the red is missing then you can't do that.

but the eye/brain compensates, and a crt with no red channel can look
ok if youre working at it, ie paying it most of your attention. Better
to leave it in colour than go to B&W, then you'll still have greens and
blues as well as sort-of-grey. But your red orange and yellows are all
history.


NT