Hi,
Thanks Graeme very much for your response. The
information you provided has been very useful to make my
understanding
of WCS and ICC profiles better.
In fact I am dealing with some products which currently
use ICC 2.0 profiles. I would like to create WCS profiles
out of
existing ICC profiles, even though back ward compatibility
is present in
WCS.
I have some more queries.
1) In your reply you specified it is generally possible to
recreate
object measurement data from LUTs in ICC profile. Could you
give me some
pointers on how we can do this?
2) You said ICC do not create "transforms on the
fly". But in ICM 2.0,
where WCS was not present at all, we could see the API
"CreateColorTransform". As per my understanding
(and your comments) this
API links the two color transforms and creates one color
transform out
of it which can be used by user application to do the color
management
in one shot.
3) Will WCS profiles in any way contain transforms in their
LUTs? For
example let me sight the following tags from WCS cdmp
schema.
<xs:complexType name="OneDimensionLutType">
<xs:sequence> <xs:element
name="Input" type="cdm:FloatList"/>
<xs:element name="Output"
type="cdm:FloatList"/> </xs:sequence>
</xs:complexType>
<xs:complexType
name="HDRToneResponseCurvesType">
<xs:sequence>
<xs:element name="RedTRC"
type="cdm:OneDimensionLutType"/>
<xs:element
name="GreenTRC"
type="cdm:OneDimensionLutType"/>
<xs:element
name="BlueTRC"
type="cdm:OneDimensionLutType"/>
</xs:sequence>
Like other tags in WCS do these tags contain only object
measurement
data?
regards,
Shameel Abdulla
-----Original Message-----
From: Graeme Gill [mailto:graeme argyllcms.com]
Sent: Tuesday, April 03, 2007 7:51 AM
To: Shameel Abdulla (WT01 - Embedded Systems)
Cc: lcms-userlists.sourceforge.net
Subject: Re: [Lcms-user] is icc profile portable to wcs
shameel.abdullawipro.com wrote:
> In question 2 you said LUTs in ICC profile contain
object measurement
> data.
ICC profile contain tables that are created from object
measurement
data. It's possible then (generally) to use those tables to
re-create
object measurement data in a way that would be suitable for
a native WCS
type profile.
> In question 3 you said ICC does not create
"transforms on the
> fly" but stores the transforms during profile
creation. Where are
> these transforms stored? Are these transforms not
stored in the LUTs?
Yes, they're stored in the A2B and B2A Luts.
> Why have WCS split the profile into three viz device,
CAM, and gamut.
> Why could nt it keep it in a single profile as ICC
profile did.?
Flexibility. You can mix and match each of these, reducing
the
combinatorial explosion that would result if you tried to
package them
all together.
Graeme Gill.
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