ZX Pilot #27 04 августа 1998

Железо

HARD and SOFT - Quenching of brightness when playing black. (Scheme)

 HARD AND SOFT


(C) ALPHA STUDIO


      Quenching of brightness
 Cherng color reproduction.


   Everyone knows that there is a possibility SPECCY color 
output with high brightness, it is necessary only mix with

luminance signal (usually in the diagrams is denoted Br) to
RGB components for feeding the TV, or connect to
the corresponding input of the monitor. In some types of 
computers, namely, the Baltic, and perhaps some other 
improvised, and previously commercially available, connecting 
the luminance signal is not produced its extinction during 
playback black. The pictures on these computers in intensive

use bright colors on a black background are quite
kind of scary. In this article we propose once and for all
ending with the glitches with the unpretentious pribombasa.

   Since the point illuminates black, provided that
RGB signals are at zero, and use it for
construction shemki. She (ie the scheme) is implemented on 
melkosheme LE4 or two other buildings of virtually any logic, 
and should fulfill the requirement: do not let the luminance 
signal when R = G = B = "0" or skip the luminance signal if at 
least one of the signals R, G or B is "1".




     Option 1 Option 2

       (LE4) (LA4, LN1)

 R 1 R 1 ■
 G ■
 B '

                              G 1 ■ ■

                1

         1 ■ Br ''
Br ■ B 1 1 ■ ■ ■ Br '

                                        Br



   I hope that this will pribombas someone useful.

20.07.98