Gray - is it gray?

Discussion in 'General Technical Discussion' started by Iliah, Mar 27, 2005.

  1. Henry Goh

    Henry Goh

    301
    Mar 17, 2005
    Singapore
    Thanks Illah

    I think if I can find a neutral grey paint with a slight shift in *a and *b values towards -ve, I would be happier when used for portraits. Would you agree Illah?

    Henry
     
  2. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    Henry, IMHO it depends on what lights you use. Do you mean both a* and b* shifted to "-"? That is, to bluish cyan?

    You can also mix Black Bone with Titanium
    White and some third paint to get the tint you wish.
     
  3. Henry Goh

    Henry Goh

    301
    Mar 17, 2005
    Singapore
    Yes Illah

    Blueish-cyan, just a tint. Maybe a= -1 b=-1

    Rather than have *a = +.2 and *b = +0.9 for example.

    Henry
     
  4. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    30 parts of Neutral Gray N5 #1445 Series 1 + 1 part Cerulean Blue, Chromium #5050 Series 7 + 1 part Cobalt Turquoise #5144 Series 8; if my calculations are correct.

    Basically, Neutral Gray N5 is Pantone Cool Gray, with slightly negative both a* and b* - L*52.02 a*-0.21 b*-0.28

    Probably Golden Artist Colors, Inc can give you a more precise answer?
     
  5. Henry Goh

    Henry Goh

    301
    Mar 17, 2005
    Singapore
    Seems right

    I think your maths should be quite right Illah. I'll check locally if someone carries Golden's products.

    Thank you Sir.

    Henry
     
  6. obelix

    obelix

    714
    Mar 17, 2005
    Fremont, CA, USA
    What on earth was all that "Greek" about? Any english translations?
     
  7. Iliah

    Iliah

    Jan 29, 2005
    nowhere
    It is about what to use to paint walls in digital darkroom, and in studio, as well as what to use for monitor hoods; how to make custom gray cards for white balance and custom gray step wedges; what industry cards and other materials are suitable for colour control.

    One more supplier for colour viewing equipment and neutral gray paint is GTI, ( http://www.gtilite.com/index.html ) B&H carries the whole line of their goods.
     
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