[comp.sys.apollo] I have a question

richard@gryphon.CTS.COM (Richard Sexton) (12/20/87)

We have a DN660.

I wrote a program that displays a rainbow by drawing 8 pixel wide
vertical strips with colors ranging from (HSL color space)

(0, 100, 50) to (360, 100, 50).

Everything with a green component looked a little funny.

So I changed the program to display a continuous tone going from

RGB = (0, 0, 0) to (0, 255, 0) and although i did get a continuous
tone from black to bright green, it appeared a little bit
like corduroy, in that it seemed to have alternating strips of
dark and light.

If I changed it to use red or blue, (0, 0, 0) to (0, 0, 255) etc. it
displyed a smooth a transition from black to red (or blue) as you could
want.

So whats the story with the green ?

Its an 8 plane 660, with a Mits. monitor.

This isn't exactly vital, I'm just curious.

Richard @ Danford


-- 
       "Well they say, that Santa Fe, is more, than 90 miles away"

{ihnp4!crash, hplabs!hp-sdd!crash}!gryphon!richard || richard@gryphon.CTS.COM

dp@JASPER.Palladian.COM (Jeffrey Del Papa) (12/21/87)

    Date: 19 Dec 87 21:21:52 GMT
    From: marque!gryphon!richard@csd1.milw.wisc.edu  (Richard Sexton)

    We have a DN660.

    I wrote a program that displays a rainbow by drawing 8 pixel wide
    vertical strips with colors ranging from (HSL color space)

    (0, 100, 50) to (360, 100, 50).

    Everything with a green component looked a little funny.

    So I changed the program to display a continuous tone going from

    RGB = (0, 0, 0) to (0, 255, 0) and although i did get a continuous
    tone from black to bright green, it appeared a little bit
    like corduroy, in that it seemed to have alternating strips of
    dark and light.

    If I changed it to use red or blue, (0, 0, 0) to (0, 0, 255) etc. it
    displyed a smooth a transition from black to red (or blue) as you could
    want.

    So whats the story with the green ?

    Its an 8 plane 660, with a Mits. monitor.

    This isn't exactly vital, I'm just curious.

    Richard @ Danford


    -- 
	   "Well they say, that Santa Fe, is more, than 90 miles away"

    {ihnp4!crash, hplabs!hp-sdd!crash}!gryphon!richard || richard@gryphon.CTS.COM

sounds like your green DAC has a bad bit.

<dp>