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profile connection in appearance matching



 
 
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Old September 16th 14, 08:37 PM posted to sci.engr.color,sci.image.processing,comp.soft-sys.matlab,rec.photo.digital,rec.photo.darkroom
Dale[_2_]
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Posts: 137
Default profile connection in appearance matching

I'm talking in terms of the icc, http://www.color.org/
but it could apply to any device independent color system

if you talk about "color" matching, it seems to me that absolute
colormetry should be the correct approach, this is simply measured and
a simple cmm can connect device colors to and from the absolute and
static profile connection space

if you are talking about "appearance" matching, an absolute color
profile connection space and a simple cmm do not apply I think, each
device and ideally its device profile have its own appearance
considerations and the cmm has to connect the "appearances" through
the profile connection space with those "appearance" considerations

it would seem to me that the correct approach is for the cmm to
instantiate a profile connection space based on the input and output
"appearance" considerations at the time of connection,

the instantiation could be an event-loop or an OO approach or
whatever, but according to CIECAM02, LMS color space is involved
http://en.wikipedia.org/wiki/CIECAM02
--
Dale
  #2  
Old September 17th 14, 05:54 AM posted to sci.engr.color,sci.image.processing,comp.soft-sys.matlab,rec.photo.digital,rec.photo.darkroom
Dale[_2_]
external usenet poster
 
Posts: 137
Default profile connection in appearance matching

On Tue, 16 Sep 2014 15:37:30 -0400, Dale
wrote:

I'm talking in terms of the icc, http://www.color.org/
but it could apply to any device independent color system

if you talk about "color" matching, it seems to me that absolute
colormetry should be the correct approach, this is simply measured and
a simple cmm can connect device colors to and from the absolute and
static profile connection space

if you are talking about "appearance" matching, an absolute color
profile connection space and a simple cmm do not apply I think, each
device and ideally its device profile have its own appearance
considerations and the cmm has to connect the "appearances" through
the profile connection space with those "appearance" considerations

it would seem to me that the correct approach is for the cmm to
instantiate a profile connection space based on the input and output
"appearance" considerations at the time of connection,

the instantiation could be an event-loop or an OO approach or
whatever, but according to CIECAM02, LMS color space is involved
http://en.wikipedia.org/wiki/CIECAM02


I notice icc has rimm and romm (reference input/output) medium metrics
that have components of appearance similiar to CIECAM02, but they
don't have a reference for display

I also gather the reference spaces are a high gamut film

shouldn't they just get rid of the references and go with a full
appearance models that instaniates a profile connection space based on
i/i paramaters, should this requires a more complex measurement
paradigm, and maybe "good enough" is "good enough"

just a thought

--
Dale
 




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