Re: [Lcms-user] Scanner calibration

[Karl H. K. <kh...@kh...>]

=2E.. and if you really want sourcecode, take a look at
http://www.scarse.org - this is a package (for Unix
however) to create scanner profiles. It does not use
lcms to read or write ICC profiles.

Karl Heinz

On Mon, Jun 11, 2001 at 05:21:10PM +0200, Mart=ED Maria wrote:
> Hi,
>=20
> Let me see if I understand the problem....
>=20
> You have an IT/8 target, then you scan this target and
> got a image in RGB. Ok right now. Then,  the IT/8 sheet
> has Lab values for patches ... and you want to
> generate a icc profile that characterizes the translation from
> your RGB values to Lab values. Is this? So, this is just what
> profiler is doing. You give to the profiler the RGB scanned
> image, the IT/8 reference sheet and the profiler resturn to you
> the icc profile.
>=20
> The full process of obtaining a profile from a set of patches is
> very complex. I can outline an algorithm for doing so, but
> there is a lot of math/color science involved... I guess is not
> worth of the effort required to just build one profile.
>=20
> If you want to use this profile somehow embedded into scanner
> firmware, you need to know in wich RGB space your scanner
> is going to work. Assuming sRGB, a transform between
> the obtained profile and sRGB profile will give to you the
> corrected RGB values.
>=20
> Mart=ED.
>=20
> ----- Original Message -----
> From: "Trigonix inc." <in...@tr...>
> To: "Mart=ED Maria" <ma...@li...>
> Sent: Monday, June 11, 2001 3:44 PM
> Subject: Re: [Lcms-user] Scanner calibration
>=20
>=20
> > Hi,
> > I don`t need a software to do the calibration.
> > the scanner i =E0 working on is under developement, and we have somme
> probleme
> > with colors :).
> > So i scanned an IT8 target and compare the value (in RGB) a obtained and
> the
> > value given with the target.
> > I know that there is a way to write a program in c++ to generate a prof=
ile
> > (icc) to do some intepolation and to calibrate the scanner but HOW?
> >
> > thanks
> >
> >
> > Mart=ED Maria wrote:
> >
> > > Hi,
> > >
> > > Building profiles is still a pending subject for little cms,
> > > however, KWLee has a free program that does just
> > > what you ask for:
> > >
> > > http://www.littlecms.com/iphoto/download.htm
> > >
> > > The profiles generated by this tool has been tested and works
> > > fine under lcms.
> > >
> > > Mart=ED.
> > >
> > > ----- Original Message -----
> > > From: "Trigonix inc." <in...@tr...>
> > > To: "Mart=ED Maria" <ma...@li...>
> > > Cc: <lcm...@li...>
> > > Sent: Monday, June 11, 2001 3:08 PM
> > > Subject: [Lcms-user] Scanner calibration
> > >
> > > >
> > > >
> > > >
> > > >
> > > > Hi,
> > > > how can i use the IT8 to generate an ICM profile to calibrate a
> scanner
> > > > that I`m working on.
> > > > Thanks.
> > > > Adil.
> > > >
> > > >
> > > > _______________________________________________
> > > > Lcms-user mailing list
> > > > Lcm...@li...
> > > > http://lists.sourceforge.net/lists/listinfo/lcms-user
> > > >
> > > >
> >
> > --
> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Certifi=E9e ISO9002 =3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> >     Trigonix Inc.
> >     80 rue Queen, bureau 101
> >     Montreal, QC, CAN  H3C 2N5
> >     Tel:   (514) 874-0443
> >     Fax:   (514) 874-0339
> >     email: in...@tr...
> >
> >
> >
> >
>=20
>=20
> _______________________________________________
> Lcms-user mailing list
> Lcm...@li...
> http://lists.sourceforge.net/lists/listinfo/lcms-user

--=20
Karl Heinz Kremer                                  kh...@kh...
PGP Key at http://www.freecolormanagement.com/download/khk.asc
EPSON Sane Backend:         http://www.freecolormanagement.com