Re: unfavorable X-Rite ColorMunki experience
Re: unfavorable X-Rite ColorMunki experience
- Subject: Re: unfavorable X-Rite ColorMunki experience
- From: "edmund ronald" <email@hidden>
- Date: Fri, 9 May 2008 17:34:41 +0200
The technical issues with color managing Raw have been mostly solved
as regards getting a "neutral" rendering from the well linearized
high-end cameras. Essentially camera manufacturers are moving to
providing explicit cam2xyz transformations. But this solution involves
specifying the spectral sensitivity of each camera sample and each
illuminant. It is now feasible to do so in practice thanks to cheap
spectroradiometers and some cheap ($10K) sensor characterization
devices.
However manufacturers of cameras would like to superpose their own
renderings -the Jpeg renderings- and this too is feasible by
overlaying an output profile over the "neutral" Raw conversion. The
profile in question can be embedded in the file at capture time, or
added later by a meta-data editor which can also write in the
illuminant data.
All the above hinges on the Raw converter being willing to pick up the
external "hints":
- An externally supplied matrix for decoding the Raw
- An externally supplied output profile for the "look".
Raw Developer can do this. However it would seem that Adobe is not
willing to give the user access to the renderings "hinted" by the
camera manufacturer or measured by the photographer. This is a
political issue, not a technical color-management related issue and
can only be settled by political discussions.
Edmund
On Fri, May 9, 2008 at 4:55 PM, Mark Segal <email@hidden> wrote:
> Andrew,
>
> Agreed, after all is said and done there are inherent differences between printers which no amount of profiling will completely overcome; but I guess the point is that if the colour management is as consistent as possible, then you have more confidence in the presumption that differences between prints are really machine-related and not due to inconsistent colour management; and this is useful to know for people making purchasing decisions - there are always trade-offs with these machines so it is good to be able to match the hardware with one's taste, knowing one isn't likely being misled by colour management issues. That said, a number of these high-end machines I've personally seen in action seem to be delivering "pretty close" results.
>
> Again, my comments aren't directed at Raw at all for reasons explained yesterday.
>
> Mark
> ----- Original Message -----
> From: Andrew Rodney
> To: Todd Shirley ; 'colorsync-users?lists.apple.com' List
> Sent: Friday, May 09, 2008 10:32 AM
> Subject: Re: unfavorable X-Rite ColorMunki experience
>
>
> On 5/9/08 8:22 AM, "Todd Shirley" wrote:
>
> > How would this NOT be useful to the end user?
>
> In terms of Raw?
>
> In terms of a printer, that would only be useful and possible if they all
> pretty much produced the same gamut and quality of prints. At least with my
> testing, I see differences which make evaluating the units useful. I'm not
> suggesting we don't profile them all, load the same paper and then print the
> same images to test the qualities of each. I'm saying doing this doesn't
> produce identical results because of the differences in say how a Canon and
> an Epson print.
>
> For Raw, I want to select the product that produces the best rendering
> possible, I don't want, and I don't expect some ICC profile will make
> Bibble, Aperture and ACR produce identical results. No more than I expect 3
> different E6 films to be the same.
>
> Andrew Rodney
> http://www.digitaldog.net/
>
>
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