RE: [Lcms-user] sRGB <--> XYZ transforms

[Richard M. <Ric...@en...>]

Hi,
I analyzed the code you provided, and it seems that I was using a wrong s=
RGB
profile
Thanks again, Marti
Best Regards

Richard


  -----Original Message-----
  From: Mart=ED Maria [mailto:ma...@li...]
  Sent: Friday, July 06, 2001 9:17 PM
  To: Richard Mitanchey
  Subject: Re: [Lcms-user] sRGB <--> XYZ transforms


  Hi,

  ??? In my test program I do obtain D65 as XYZ when feed with 0xff, 0xff=
,
0xff, and the back transform also
  returns 0xff, 0xff, 0xff.

  I am sending the program to you. If anybody else is interested, please =
let
me know and I will send it as well.

  Regards,
  Mart=ED.

    ----- Original Message -----
    From: Richard Mitanchey
    To: lcm...@li...
    Sent: Friday, July 06, 2001 9:29 AM
    Subject: [Lcms-user] sRGB <--> XYZ transforms


    Dear list members,
    I'm confused with sRGB <--> XYZ transforms (yes, I've read the Annex =
B
of tutorial, and used cmsFLAGS_NOTPRECALC with INTENT_ABSOLUTE_COLORIMETR=
IC)
    My observations are:
    sRGB white point (255, 255, 255) is transformed into (30457, 32152,
35275) XYZ color, and back-transformed to sRGB gray point (240, 248, 250).
    Is there any way to prevent this, or am I performing a bad transform =
?
    Thank you in advance
    Richard Mitanchey
    Ing=E9nieur des TPE, Docteur en Informatique
    Groupe Lumi=E8re et Rayonnement Electromagn=E9tique
    Laboratoire des Sciences de l=92Habitat (LASH)
    D=E9partement G=E9nie Civil et B=E2timent (DGCB) URA CNRS 1652
    Ecole Nationale des Travaux Publics de l'Etat