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Conference bulova::decw_jan-89_to_nov-90

Title:DECWINDOWS 26-JAN-89 to 29-NOV-90
Notice:See 1639.0 for VMS V5.3 kit; 2043.0 for 5.4 IFT kit
Moderator:STAR::VATNE
Created:Mon Oct 30 1989
Last Modified:Mon Dec 31 1990
Last Successful Update:Fri Jun 06 1997
Number of topics:3726
Total number of notes:19516

2894.0. "why gray scale ?" by CHOVAX::LAYTON (Dave Layton Software Specialist @CHO) Thu Jun 07 1990 11:49

    A customer with the Session Manager window color settings set as
    follows:
    R = 0
    G = 43
    B = 9
    
    Can't print to an ln03R unless he uses gray scale printing.
    Can someone explain why this occurs ?  We have other folks
    with different setting that can print in normal mode.
    
    Dave
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2894.1A guess...if this makes not sense, we need more infoDECWIN::FISHERPrune Juice: A Warrior's Drink!Thu Jun 07 1990 13:5621
Maybe someone closer to the subject can figure out the answer from just your
question, but as a generalist, I would have to ask for a lot more information.

For example, you say "window color settings" but only give one setting.  Which
one is that foreground?  background?  What is the other one?  I'll assume they
are low contrast.

You say grayscale printing.  I assume you are talking about PrintScreen?  Are
you getting output in PostScript or DDIF?  I assume PostScript.

You say "can't print".  Does that mean that the paper does not come out, that the
printer goes up in smoke, that the paper has nothing on it, that it is garbled,
etc etc?  I assume you get a more-or-less blank (or black) sheet.

Based on making assumptions about the answers to the above as well as a whole
series of guesses about other things I don't know about, I suspect the problem
may be that the "black and white" mode simply does a simple look at the colors
and everything that is brighter than a certain level becomes white and darker
becomes gray.  If the fg and bg are set in such a way that they contrast when
seen in color, but are both fairly dim or fairly bright, the simple black/white
algorithm will translate them both to either black or white.
2894.2More InfoCHOVAX::LAYTONDave Layton Software Specialist @CHOFri Jun 08 1990 16:417
    .1 refers to forground the following is background
    r=100
    g=93
    b=80
    
    Yes I'm talking about a PrintScreen in PostScript format.
    Can't Print = Blank sheet of paper