Re: [Lcms-user] Profile/conversion problem

[Gunnar L. <ki...@f1...>]

Hi Mart=ED,

thanks for the answer.
The image is an 8-Bit TIFF. I tried also the other profile you recommended
but it also converts it to this wired colors???

I just tried to convert it in Photoshop using the profile just to be sure
that Linocolor doesn't do any extra conversion. The image in Photoshop look=
s
like the one from Linocolor.

I have put two sample image and the profile on the FTP Server. It would be
great if you find the time to check it. Please let me know.
The files are:

LAB image:  http://199.108.103.177/staff/gunnar/lcms/44414LAB_small.tif
CMYK image: http://199.108.103.177/staff/gunnar/lcms/44414CMYK_small.tif
(Converted using Linocolor)
Profile:=20
http://199.108.103.177/staff/gunnar/lcms/Offset_Euro_pos_U340_K95.icm

Thanks,

Gunnar



am 21.01.2002 14:01 Uhr schrieb Mart=ED Maria unter ma...@li...:

> Hi,
>=20
>> I'm trying to reproduce a color conversion from LAB->CMYK. The original
>> conversion is made by Heidelberg Linocolor.
>>=20
>> I'm not able to get similar values by doing it in LCMS. The olny profile=
 I
>> can use is Tiflab8space.icm. If I don't specify the profile and it uses =
the
>=20
> Are you decoding a TIFF file?. Tiflab8space.icm is only valid on 8-bit TI=
FF.
> This profile does hold Lab AND a special decoding  for 8 bit TIFF.
> If your Lab source is any other, INCLUDING 16 BIT TIFF, try
> lcmslabi.icm. Programatically, you can use the new built-in Lab profile:
>=20
> cmsCreateLabProfile(NULL)
>=20
> That  is present on ver 1.08. I would recommend this latter, since it
> takes 0 bytes on disk. If you are using tifficc, lcmslabi.icm will do the
> job. I have done a lot of testing on Lab->CMYK and works quite well.
>=20
> About the embedded profile... if the file is storing data on Lab space, t=
here
> is no need of embedded profile, data is already device independent.
>=20
> Regards,
> Mart=ED Maria
> The little cms project
> http://www.littlecms.com
> ma...@li...
>=20
>=20
> ----- Original Message -----
> From: "Gunnar Lieb" <ki...@f1...>
> To: <Lcm...@li...>
> Sent: Sunday, January 20, 2002 2:13 PM
> Subject: [Lcms-user] Profile/conversion problem
>=20
>=20
>> Hi,
>>=20
>> I'm trying to reproduce a color conversion from LAB->CMYK. The original
>> conversion is made by Heidelberg Linocolor.
>>=20
>> I'm not able to get similar values by doing it in LCMS. The olny profile=
 I
>> can use is Tiflab8space.icm. If I don't specify the profile and it uses =
the
>> embeded I get strange colors. It looks like solarized!. If I use the
>> mentioned LAB profile there a big differences in the color. I.e. I get i=
n
>> - Linocolor conversion a blue with c96 m72 y0 k0
>> - LCMS conversion with c95 m66 y13 k5
>>=20
>> I tried the t option with all values, but the conversion remained differ=
ent.
>>=20
>> So with does the embedded profile produces such a strange color?
>> Are there any other options to look for?
>>=20
>> Thanks,
>>=20
>> Gunnar
>>=20
>>=20
>> _______________________________________________
>> Lcms-user mailing list
>> Lcm...@li...
>> https://lists.sourceforge.net/lists/listinfo/lcms-user
>>=20
>>=20
>=20
>=20
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