Forum: Digital Photography
January 21st 15, 12:04 PM Posted to sci.engr.color,sci.image.processing,rec.photo.digital,rec.photo.darkroom,comp.graphics.apps.gimp
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Replies: 4
Views: 665
LMS and CMF spectral sensitivities?
Am 21.01.2015 um 06:42 schrieb Dale:
okay, LMS is still the response of the cones and photopic vision?
LMS is not XYZ. LMS space is defined by the sensitivity curves of the
cones. Rod vision is...
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Forum: Digital Photography
January 20th 15, 02:01 PM Posted to sci.engr.color,sci.image.processing,rec.photo.digital,rec.photo.darkroom,comp.graphics.apps.gimp
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Replies: 4
Views: 665
LMS and CMF spectral sensitivities?
Am 12.01.2015 um 02:03 schrieb Dale:
does CIE measure the rods/cones/LMS spectral sensitivity
chemically or by observer experiments?
CIE defines three curves, and these curves are...
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Forum: Digital Photography
December 12th 12, 05:47 PM Posted to sci.engr.color,sci.image.processing,rec.photo.darkroom,rec.photo.digital
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Replies: 24
Views: 987
color wheel
On 12.12.2012 09:15, Dale wrote:
My Uncle is an artist
I have ten years work experience as an imaging system engineer
I was always under the impression that CMY were the color complements...
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Forum: In The Darkroom
December 12th 12, 05:47 PM Posted to sci.engr.color,sci.image.processing,rec.photo.darkroom,rec.photo.digital
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Replies: 24
Views: 3,969
color wheel
On 12.12.2012 09:15, Dale wrote:
My Uncle is an artist
I have ten years work experience as an imaging system engineer
I was always under the impression that CMY were the color complements...
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Forum: Digital Photography
November 21st 12, 03:20 PM Posted to sci.engr.color,sci.image.processing,rec.photo.darkroom,rec.photo.digital
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Replies: 20
Views: 2,261
gimp and ICC color working spaces
On 20.11.2012 05:27, Dale wrote:
On 11/18/2012 04:32 AM, Thomas Richter wrote:
Am 18.11.2012 04:42, schrieb Dale:
On 11/17/2012 06:05 AM, Thomas Richter wrote:
The ICC profile contains...
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Forum: Digital Photography
November 18th 12, 09:32 AM Posted to sci.engr.color,sci.image.processing,rec.photo.darkroom,rec.photo.digital
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Replies: 20
Views: 2,261
gimp and ICC color working spaces
Am 18.11.2012 04:42, schrieb Dale:
On 11/17/2012 06:05 AM, Thomas Richter wrote:
The ICC profile contains enough information to convert from the device
color space to the PCS and back
...
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Forum: Digital Photography
November 17th 12, 11:05 AM Posted to sci.engr.color,sci.image.processing,rec.photo.darkroom,rec.photo.digital
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Replies: 20
Views: 2,261
gimp and ICC color working spaces
On 17.11.2012 01:36, Dale wrote:
*Sigh*, no I'm not confusing this. I've already written CMMs, if you
care. The PCS does not have rendering choices in the same sense that the
R^3 does not...
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Forum: Digital Photography
November 16th 12, 08:11 AM Posted to sci.engr.color,sci.image.processing,rec.photo.darkroom,rec.photo.digital
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Replies: 20
Views: 2,261
gimp and ICC color working spaces
Am 16.11.2012 01:59, schrieb Dale:
On 11/15/2012 09:03 AM, Thomas Richter wrote:
Am 15.11.2012 02:57, schrieb Dale:
CIECAM would be better, of course you have to pick a standard...
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Forum: Digital Photography
November 15th 12, 02:10 PM Posted to sci.engr.color,sci.image.processing,rec.photo.darkroom,rec.photo.digital
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Replies: 20
Views: 2,261
gimp and ICC color working spaces
Am 15.11.2012 04:18, schrieb Dale:
On 11/14/2012 05:29 AM, Thomas Richter wrote:
did you say before that gimp's CMM was 8bit?
Yes, it's to my very knowledge .
8bit encompasses the visual...
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Forum: Digital Photography
November 15th 12, 02:03 PM Posted to sci.engr.color,sci.image.processing,rec.photo.darkroom,rec.photo.digital
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Replies: 20
Views: 2,261
gimp and ICC color working spaces
Am 15.11.2012 02:57, schrieb Dale:
CIECAM would be better, of course you have to pick a standard CAM
(appearance) for the profile connection space to convert between CAMs
the current ICC...
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Forum: Digital Photography
November 14th 12, 10:29 AM Posted to sci.engr.color,sci.image.processing,rec.photo.darkroom,rec.photo.digital
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Replies: 20
Views: 2,261
gimp and ICC color working spaces
Am 14.11.2012 05:56, schrieb Dale:
gimp has 2 use cases
1) monitor proofing
2) print proofing
yet it only has RGB and CMYK choices for working spaces
I don't know if Photoshop or...
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Forum: In The Darkroom
November 2nd 12, 06:29 PM Posted to rec.photo.digital,rec.photo.darkroom,sci.image.processing,sci.engr.color
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Replies: 28
Views: 4,186
ICC profile connection space
Am 02.11.2012 14:01, schrieb Dale:
On 11/02/2012 03:57 AM, Thomas Richter wrote:
Am 02.11.2012 06:49, schrieb Dale:
look here http://www.color.org/v4_prmg.xalter
What has this...
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Forum: Digital Photography
November 2nd 12, 06:29 PM Posted to rec.photo.digital,rec.photo.darkroom,sci.image.processing,sci.engr.color
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Replies: 28
Views: 1,646
ICC profile connection space
Am 02.11.2012 14:01, schrieb Dale:
On 11/02/2012 03:57 AM, Thomas Richter wrote:
Am 02.11.2012 06:49, schrieb Dale:
look here http://www.color.org/v4_prmg.xalter
What has this...
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Forum: Digital Photography
November 2nd 12, 07:57 AM Posted to rec.photo.digital,rec.photo.darkroom,sci.image.processing,sci.engr.color
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Replies: 28
Views: 1,646
ICC profile connection space
Am 02.11.2012 06:49, schrieb Dale:
look here http://www.color.org/v4_prmg.xalter
What has this to do with the PCS? It is just a refinement how to
implement the perceptual rendering intent.
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Forum: In The Darkroom
November 2nd 12, 07:57 AM Posted to rec.photo.digital,rec.photo.darkroom,sci.image.processing,sci.engr.color
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Replies: 28
Views: 4,186
ICC profile connection space
Am 02.11.2012 06:49, schrieb Dale:
look here http://www.color.org/v4_prmg.xalter
What has this to do with the PCS? It is just a refinement how to
implement the perceptual rendering intent.
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Forum: In The Darkroom
November 1st 12, 10:01 AM Posted to rec.photo.digital,rec.photo.darkroom,sci.image.processing,sci.engr.color
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Replies: 28
Views: 4,186
ICC profile connection space
Am 01.11.2012 09:53, schrieb Dale:
On 10/31/2012 03:40 AM, Thomas Richter wrote:
Second, gimp doesn't allow you to use a fully calibrated color workflow,
it only operates in the 8bpp "color...
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Forum: Digital Photography
November 1st 12, 10:01 AM Posted to rec.photo.digital,rec.photo.darkroom,sci.image.processing,sci.engr.color
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Replies: 28
Views: 1,646
ICC profile connection space
Am 01.11.2012 09:53, schrieb Dale:
On 10/31/2012 03:40 AM, Thomas Richter wrote:
Second, gimp doesn't allow you to use a fully calibrated color workflow,
it only operates in the 8bpp "color...
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Forum: Digital Photography
November 1st 12, 09:58 AM Posted to rec.photo.digital,rec.photo.darkroom,sci.image.processing,sci.engr.color
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Replies: 28
Views: 1,646
ICC profile connection space
Am 01.11.2012 09:54, schrieb Dale:
and gimp doesn't allow you to choose the connection space, I think this
is specified in the profiles not the CMM
Why should gimp do that?
because...
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Forum: In The Darkroom
November 1st 12, 09:58 AM Posted to rec.photo.digital,rec.photo.darkroom,sci.image.processing,sci.engr.color
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Replies: 28
Views: 4,186
ICC profile connection space
Am 01.11.2012 09:54, schrieb Dale:
and gimp doesn't allow you to choose the connection space, I think this
is specified in the profiles not the CMM
Why should gimp do that?
because...
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Forum: In The Darkroom
October 31st 12, 07:40 AM Posted to rec.photo.digital,rec.photo.darkroom,sci.image.processing,sci.engr.color
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Replies: 28
Views: 4,186
ICC profile connection space
Am 30.10.2012 12:50, schrieb Dale:
I will restate, it is the intent and working space I have a problem with
and in so the CMM.
the perceptual and saturation and relative colorimetric intents...
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Forum: Digital Photography
October 31st 12, 07:40 AM Posted to rec.photo.digital,rec.photo.darkroom,sci.image.processing,sci.engr.color
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Replies: 28
Views: 1,646
ICC profile connection space
Am 30.10.2012 12:50, schrieb Dale:
I will restate, it is the intent and working space I have a problem with
and in so the CMM.
the perceptual and saturation and relative colorimetric intents...
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Forum: In The Darkroom
October 29th 12, 08:52 AM Posted to rec.photo.digital,rec.photo.darkroom,sci.image.processing,sci.engr.color
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Replies: 28
Views: 4,186
ICC profile connection space
Am 27.10.2012 16:56, schrieb Dale:
not exactly, you can't have an absolute profile connection space and
have appearance matching, you need a reference medium for the profile
connection space,...
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Forum: Digital Photography
October 29th 12, 08:52 AM Posted to rec.photo.digital,rec.photo.darkroom,sci.image.processing,sci.engr.color
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Replies: 28
Views: 1,646
ICC profile connection space
Am 27.10.2012 16:56, schrieb Dale:
not exactly, you can't have an absolute profile connection space and
have appearance matching, you need a reference medium for the profile
connection space,...
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Forum: Digital Photography
October 29th 12, 08:48 AM Posted to rec.photo.digital,rec.photo.darkroom,sci.image.processing,sci.engr.color
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Replies: 28
Views: 1,646
ICC profile connection space
Am 27.10.2012 16:27, schrieb Dale:
isn't this the XYZ relative to an ideal print?
No. XYZ is a perfectly additive space based on physical intensities and
spectral curves based on work of the...
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Forum: In The Darkroom
October 29th 12, 08:48 AM Posted to rec.photo.digital,rec.photo.darkroom,sci.image.processing,sci.engr.color
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Replies: 28
Views: 4,186
ICC profile connection space
Am 27.10.2012 16:27, schrieb Dale:
isn't this the XYZ relative to an ideal print?
No. XYZ is a perfectly additive space based on physical intensities and
spectral curves based on work of the...
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