+-+-+-+› "COLORBAR.OBJ" PROGRAM WILL  BE  FOUND› ON THIS  Sept/Oct 1995 OL' HACKERS AUG›           NEWSLETTER DISK!›› WHAT IS IT?››    COLORBAR.OBJ is a  binary load file› which,   when  loaded,  displays  NTSC› Color Bars on a color  TV  or  monitor› (or  a  grey  scale  on  a  Black  and› White).   This  is  very  useful   for› calibration  of  your  set, so that if› you write programs  which  use  color,› you  know  that  the colors you choose› will be correct.›› WHAT IS IT USED FOR?››    These bars are  used  by  broadcast› engineers  to  test the calibration on› video transmissions.  To  insure  that› the bars which the Atari will generate› conform to  the  NTSC  standard,  they› were checked using a vector scope (for› the hue) and a waveform  monitor  (for› the luminance level).›› IMPORTANT›› -----------------------------------› ALL AUTOMATIC COLOR AND LEVEL CONT-› ROLS MUST BE OFF BEFORE YOU BEGIN› MAKING ADJUSTMENTS!!!!!!!!!!!!!!!› -----------------------------------›› WHAT YOU SHOULD SEE!››    The  following  is a description of› the correct  color/luminance  of  each› bar:›   1. The first WHITE bar (far left)    › is should be 75%  luminance  and  pure› WHITE.  More  about  this   (luminance› levels) later.›   2.  The  second bar should be YELLOW› in hue and have a luminance  level  of› approx. 65%.›   3.  The third bar should appear CYAN› (which is a light aqua-marinish color)› with  a  luminance  level  of  approx.› 55%.›   4. Bar #4 should look GREEN and have› a luminance level of 45%.›   5. The fifth bar is MAGENTA  with  a› luminance level of 35%.›   6. The sixth bar is a pure RED, with› a luminance level of 25%.›   7. The seventh bar (far  right)   is› pure  BLUE  and  will have a luminance› level of about 15%.››› PLUGE (WHATS THAT?) -----››      The PLUGE  BARS  (which  are  the› small  rectangular bars just below the› long vertical color bars) are  use  to› set  monitors that have the capability› to show only BLUE.  If yours does  not› have  this feature (most home monitors› do not), you may skip this section.›› HOW TO USE PLUGE BARS!››      To use PLUGE, set your monitor to› the BLUE ONLY position, and adjust the› CHROMA (color) control, until  Bar  #1› (top  left)  and  Bar  #7  (top right)› match the PLUGE  bars  below  them  in› luminance level.›      Then,  adjust  the   HUE   (tint)› control  until  the two inner bars (#3› and #5)  match  the  PLUGE  bars  just› below them.  When you return to normal› video, your color and  hue  will  have› been set correctly.››           WHITE REFERENCE BAR›           -------------------›     The  WHITE  REFERENCE BAR (the big› square block at  the  bottom  of  your› screen) has a luminance level of about› 90% (the real reference bar  is  100%,› but the Atari can't generate more than› 90% luminance) and should  be  a  PURE› WHITE.  It should appear just slightly› brighter than Bar #1.››            LUMINANCE LEVEL›            ---------------›     Luminance    level   is  generally› unimportant   to   a  user  without  a› luminance meter.  If you do not own  a› luminance  meter,  you  will  have  to› eyeball this one.›› HOW TO USE LUMINANCE LEVEL!››      This  is  done  by  removing  all› color  from  the  screen (by adjusting› the COLOR or  CHROMA  control  to  its› lowest point).›      Then, using the CONTRAST control,› adjust   the   screen   to   what  you› determine  as  an  acceptable  viewing› level.›      Then, adjust  the  BRIGHTNESS  or› BLACK  LEVEL  control so that the BLUE› bar  (#7)  is  just  indistinguishable› from the background color.  You should› now  see  even  steps  of   decreasing› luminance from left to right.›      If not, readjust the CONTRAST and› BRIGHTNESS   until   you   see    this› progression.›      Finally,  readjust  the  COLOR or› CHROMA control so that the  colors  do› not     appear     too     saturated. › Oversaturation, if it exists, will  be› especially  noticeable in the RED (#6)› bar.›› --------------------------------------›    Following the steps above will give› you a happy and well-adjusted set.›                <-> <->›