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ICC gamut mapping



 
 
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  #1  
Old March 6th 14, 05:59 AM posted to sci.engr.color,sci.image.processing,rec.photo.darkroom,rec.photo.digital,comp.soft-sys.matlab
Dale[_4_]
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Posts: 131
Default ICC gamut mapping

The ICC
http://www.color.org
has four gamut rendering intents

colorimetric, including light source conversion as some semblance of
appearance consideration, and no shrinking of the output gamut to
include out of gamut colors, out of gamut colors are clipped to the
output gamut

absolute colorimetric, no light source conversion, no output gamut
shrinking, for measurement use cases primarily I guess

saturation, where the output gamut is shrunk considering saturation to
include colors mapped to the output space that are out of gamut with the
saturation maintained over color considerations

perceptual, where the output gamut is shrunk to include out of gamut
colors in a pleasant appearance based on an ideal print gamut, PRM(G)
http://www.color.org/v4_prmg.xalter

wouldn't it be better to provide the user more choices on perceptual
rendering based on different outputs? transparencies and translucencies
have a much bigger gamut than a print and are created digitally now too

I don't remember the math terms used for gamut construction and
conversion, I used to work/edit with MATLAB scripts from the scientists
that did this but I was just a systems engineer

--
Dale
  #2  
Old March 6th 14, 08:09 AM posted to sci.engr.color,sci.image.processing,rec.photo.darkroom,rec.photo.digital,comp.soft-sys.matlab
Dale[_4_]
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Posts: 131
Default ICC gamut mapping

On 03/06/2014 12:59 AM, Dale wrote:
wouldn't it be better to provide the user more choices on perceptual
rendering based on different outputs? transparencies and translucencies
have a much bigger gamut than a print and are created digitally now too


projections (motion picture, business, etc.) fall into this category too

--
Dale
  #3  
Old March 6th 14, 08:12 AM posted to sci.engr.color,sci.image.processing,rec.photo.darkroom,rec.photo.digital,comp.soft-sys.matlab
Dale[_4_]
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Posts: 131
Default ICC gamut mapping

On 03/06/2014 12:59 AM, Dale wrote:
wouldn't it be better to provide the user more choices on perceptual
rendering based on different outputs? transparencies and translucencies
have a much bigger gamut than a print and are created digitally now too


there is also the use case of soft display as opposed to soft proof

sure, you could probably configure a soft proof implementation for soft
display, but that is kludgey

soft display would require the rendering intents to be applied to the
input, if output from there an appearance standard/choice would be
required to meet the output intent chosen

--
Dale
  #4  
Old March 7th 14, 11:26 AM posted to sci.engr.color,sci.image.processing,rec.photo.darkroom,rec.photo.digital,comp.soft-sys.matlab
Neil Ellwood
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Posts: 493
Default ICC gamut mapping

On Thu, 06 Mar 2014 00:59:14 -0500, Dale wrote:

The ICC http://www.color.org has four gamut rendering intents

Still talking to yourself.




--
Neil
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Remove ‘l’ to get address.
  #5  
Old March 8th 14, 06:50 AM posted to sci.engr.color,sci.image.processing,rec.photo.darkroom,rec.photo.digital,comp.soft-sys.matlab
Dale[_4_]
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Posts: 131
Default ICC gamut mapping

On 03/07/2014 06:26 AM, Neil Ellwood wrote:
On Thu, 06 Mar 2014 00:59:14 -0500, Dale wrote:

The ICC http://www.color.org has four gamut rendering intents

Still talking to yourself.





nothing better to do

--
Dale
 




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