RE: Colorsync-users Digest, Vol 6, Issue 145
RE: Colorsync-users Digest, Vol 6, Issue 145
- Subject: RE: Colorsync-users Digest, Vol 6, Issue 145
- From: "Kircheim, Anthony HUS" <email@hidden>
- Date: Wed, 1 Jul 2009 15:09:52 -0400
- Acceptlanguage: en-US
- Thread-topic: Colorsync-users Digest, Vol 6, Issue 145
Hey Ken,
I can make you a hood for $500 and you can use it on any monitor... Pick your color also...
Anthony Kircheim
Applications Specialist
Heidelberg U.S.A.
1000 Gutenberg Drive
Kennesaw Ga. 30144
678-354-8122
email@hidden
Does anyone know if you can buy the hood for the LaCie 324 monitor without
the need to buy the calibration software? I can only find the monitor
bundled with the hood/software but not just the hood.
-----Original Message-----
From: colorsync-users-bounces+anthony.kircheim=email@hidden [mailto:colorsync-users-bounces+anthony.kircheim=email@hidden] On Behalf Of email@hidden
Sent: Wednesday, July 01, 2009 3:05 PM
To: email@hidden
Subject: Colorsync-users Digest, Vol 6, Issue 145
Send Colorsync-users mailing list submissions to
email@hidden
To subscribe or unsubscribe via the World Wide Web, visit
http://lists.apple.com/mailman/listinfo/colorsync-users
or, via email, send a message with subject or body 'help' to
email@hidden
You can reach the person managing the list at
email@hidden
When replying, please edit your Subject line so it is more specific
than "Re: Contents of Colorsync-users digest..."
Today's Topics:
1. LaCie 324 Hood (Fleisher, Ken)
2. Chromatic adaptation -- original Von Kries ideas (Roger)
3. Re: Chromatic adaptation -- original Von Kries ideas (Graeme Gill)
4. Re: Chromatic adaptation -- original Von Kries ideas
(edmund ronald)
----------------------------------------------------------------------
Message: 1
Date: Tue, 30 Jun 2009 15:51:58 -0400
From: "Fleisher, Ken" <email@hidden>
Subject: LaCie 324 Hood
To: colorsync-users List <email@hidden>
Message-ID: <C66FE51E.D154%email@hidden>
Content-Type: text/plain; charset="US-ASCII"
Does anyone know if you can buy the hood for the LaCie 324 monitor without
the need to buy the calibration software? I can only find the monitor
bundled with the hood/software but not just the hood.
Thanks!
--
Ken Fleisher
Photographer
Imaging & Visual Services
National Gallery of Art
Washington, D.C.
Phone: (202) 712-7471
email@hidden
------------------------------
Message: 2
Date: Tue, 30 Jun 2009 19:10:18 -0400
From: Roger <email@hidden>
Subject: Chromatic adaptation -- original Von Kries ideas
To: 'colorsync-users List' <email@hidden>
Message-ID: <003c01c9f9d7$ef83ffe0$ce8bffa0$@ca>
Content-Type: text/plain; charset=US-ASCII
Hello folks,
I've been digging into the original concepts behind chromatic adaptation
lately and found myself returning to the Von Kries literature. His rules of
adaptation state that the cones spectral sensitivities are invariant (fixed)
and independent from each other. Chromatic adaptation is often presented in
the context of how to adapt some object color tristimulus values between two
sets of illumination or illuminants (D50 vs D65 as in ICC PCS). But I also
often find mention of this idea of 'Reference', as in Reference white. I
realize that the Reference white in question is the one to which the
observer is currently adapted. But could there be another notion of
Reference White where our that our brain has always access to? To which all
illuminations are always compared? Naturally? Possibly linked to the idea of
color constancy?
I don't find anything in the literature to substantiate this idea. Is this
too far-fetch an idea or could this make any sense conceptually? For
example, suppose I observe a red apple under direct sunlight. My brain has
no problem recognizing the apple from the combined apple spectral
reflectance and sunlight spectral energy. My cones, somehow, are adapted to
this "sunlight" and correctly infer the visual cues from the scene to adjust
the Von Kries Coefficients in my cones, so to speak, so that the red apple
appears like a red color I've learned to expect.
But suppose I now step indoor with my red apple, and I'm seeing it under
tungsten light. My question is : could it be argued that the "red" color
will appear red as though my brain has somehow adjust the gain sensitivities
of my cones to render the red to some abstract, possibly innate, notion of
"white", that would be independent of the scene? Maybe I'm trying to read
too much in chromatic adaptation?
Roger
------------------------------
Message: 3
Date: Wed, 01 Jul 2009 10:00:24 +1000
From: Graeme Gill <email@hidden>
Subject: Re: Chromatic adaptation -- original Von Kries ideas
To: ColorSync <email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Roger wrote:
> But suppose I now step indoor with my red apple, and I'm seeing it under
> tungsten light. My question is : could it be argued that the "red" color
> will appear red as though my brain has somehow adjust the gain sensitivities
> of my cones to render the red to some abstract, possibly innate, notion of
> "white", that would be independent of the scene? Maybe I'm trying to read
> too much in chromatic adaptation?
Hi Roger,
I don't imagine that this is a realistic mechanism, since cone
gain sensitivity adjustment seems to be low level and automatic.
More likely that there are several stages of adaptation, with latter
ones occurring further along the vision processing/interpretation pipeline.
Some may be partially learned, and therefore influenced by what we
recognise.
I'm certainly conscious of some situations (tinted paper) where
the cone adjustment is incomplete (meaning that the paper looks
tinted), yet photographs reproduced on the paper appear to
have white highlights. So the cone adaptation is partial, and it
must be the higher lever image interpretation processing that
is doing the rest of the adaptation.
Graeme Gill.
------------------------------
Message: 4
Date: Wed, 1 Jul 2009 13:28:29 +0900
From: edmund ronald <email@hidden>
Subject: Re: Chromatic adaptation -- original Von Kries ideas
To: Roger <email@hidden>
Cc: colorsync-users List <email@hidden>
Message-ID:
<email@hidden>
Content-Type: text/plain; charset=ISO-8859-1
There are two different issues here:
- Can we in simple cases for colored object found in nature compute
what a colorimeter would see when changing illuminant, when the before
and after illuinant is known? The answer seems to be supplied by the
Von Kries transforms.
- How does the brain decide which transform to apply?
Edmund
On Wed, Jul 1, 2009 at 8:10 AM, Roger<email@hidden> wrote:
> Hello folks,
>
>
>
> I've been digging into the original concepts behind chromatic adaptation
> lately and found myself returning to the Von Kries literature. His rules of
> adaptation state that the cones spectral sensitivities are invariant (fixed)
> and independent from each other. Chromatic adaptation is often presented in
> the context of how to adapt some object color tristimulus values between two
> sets of illumination or illuminants (D50 vs D65 as in ICC PCS). But I also
> often find mention of this idea of 'Reference', as in Reference white. I
> realize that the Reference white in question is the one to which the
> observer is ?currently adapted. But could there be another notion of
> Reference White where our that our brain has always access to? To which all
> illuminations are always compared? Naturally? Possibly linked to the idea of
> color constancy?
>
>
>
> I don't find anything in the literature to substantiate this idea. Is this
> too far-fetch an idea or could this make any sense conceptually? For
> example, suppose I observe a red apple under direct sunlight. My brain has
> no problem recognizing the apple from the combined apple spectral
> reflectance and sunlight spectral energy. My cones, somehow, are adapted to
> this "sunlight" and correctly infer the visual cues from the scene to adjust
> the Von Kries Coefficients in my cones, so to speak, so that the red apple
> appears like a red color I've learned to expect.
>
>
>
> But suppose I now step indoor with my red apple, and I'm seeing it under
> tungsten light. My question is : could it be argued that the "red" color
> will appear red as though my brain has somehow adjust the gain sensitivities
> of my cones to render the red to some abstract, possibly innate, notion of
> "white", that would be independent of the scene? Maybe I'm trying to read
> too much in chromatic adaptation?
>
>
>
> Roger
>
> ?_______________________________________________
> Do not post admin requests to the list. They will be ignored.
> Colorsync-users mailing list ? ? ?(email@hidden)
> Help/Unsubscribe/Update your Subscription:
>
> This email sent to email@hidden
>
------------------------------
_______________________________________________
Colorsync-users mailing list
email@hidden
http://lists.apple.com/mailman/listinfo/colorsync-users
End of Colorsync-users Digest, Vol 6, Issue 145
***********************************************
Confidentiality note:
The information in this email and any attachment may contain confidential and proprietary information of Heidelberger Druckmaschinen AG and/or its affiliates and may be privileged or otherwise protected from disclosure. If you are not the intended recipient, you are hereby notified that any review, reliance or distribution by others or forwarding without express permission is strictly prohibited and may cause liability. In case you have received this message due to an error in transmission, we kindly ask you to notify the sender immediately and to delete this email and any attachment from your system.
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden