general question to group

[Adam K]

Hi,
I'm going to buy Macbook pro. Is this one good enough to process pictures,
mainly NEFs using DxO and LR? Graphics?
Thank you!
--
Adam Kielcz

Note: If you forward this email, please delete the forwarding
history, which includes my email address and any others you see in
this email. It is a courtesy to me and others who may not wish to have
their email addresses sent all over the world. Erasing the history
also helps prevent Spammers from gathering addresses and prevents
viruses from being sent to your friends and mine.
---------------------------------------------------------------------------------------
No trees were harmed in the posting of this message . . . however an
extraordinarily large number of electrons were horribly
inconvenienced.

[Roger Breton]

That's a lot of money :(



From: argyllcms-bounce-***@public.gmane.org [mailto:argyllcms-bounce-***@public.gmane.org]
On Behalf Of Adam K
Sent: 20 septembre 2014 12:04
To: argyllcms-***@public.gmane.org
Subject: [argyllcms] general question to group



Hi,

I'm going to buy Macbook pro. Is this one good enough to process pictures,
mainly NEFs using DxO and LR? Graphics?

Thank you!
--
Adam Kielcz



Note: If you forward this email, please delete the forwarding history,
which includes my email address and any others you see in this email. It is
a courtesy to me and others who may not wish to have their email addresses
sent all over the world. Erasing the history also helps prevent Spammers
from gathering addresses and prevents viruses from being sent to your
friends and mine.
----------------------------------------------------------------------------
-----------
No trees were harmed in the posting of this message . . . however an
extraordinarily large number of electrons were horribly inconvenienced.

[carlo rondinelli]

...try also RawTherapee, it's free and probably the best.
--
Carlo Rondinelli - Still-life e Fotografia Immersiva per Virtual Tour
mob: + 39 389 9757042
skype: carlopano360
flickr.com/photos/carlorondinelli
alessiasalera.com

Avvertenze ai sensi del D.L.G.S. 196/2003 e successivi
Le informazioni contenute in questo messaggio e/o nel/i file/s allegato/i, sono da considerarsi strettamente riservate.
Il loro utilizzo è consentito esclusivamente al destinatario del messaggio per le finalità indicate nel messaggio stesso.
Colui che riceve il presente messaggio è gentilmente pregato di verificare se lo stesso non gli sia pervenuto per errore.
In tal caso il destinatario è pregato di avvisare il mittente e, tenuto conto delle responsabilità connesse all'indebito
utilizzo e/o divulgazione del messaggio e/o delle informazioni in esso contenute, di cancellare l'originale
oltre a distruggere ogni copia o stampa.

[Stephen T]

This is not an argyllcms question. I don't know Apple, but think you will still require a high quality display in you office. A calibrated laptop is OK on the road, but the size, quality and viewing conditions are not enough for critical photo editing. So I plug my NEC display into the HDMI port of my laptop. It doesn't matter that my laptop display is crap.

Stephen.



On Sunday, 21 September 2014, 2:50, carlo rondinelli <***@alessiasalera.com> wrote:



...try also RawTherapee, it's free and probably the best.
--
Carlo Rondinelli - Still-life e Fotografia Immersiva per Virtual Tour
mob: + 39 389 9757042
skype: carlopano360
flickr.com/photos/carlorondinelli
alessiasalera.com

Avvertenze ai sensi del D.L.G.S. 196/2003 e successivi
Le informazioni contenute in questo messaggio e/o nel/i file/s allegato/i, sono da considerarsi strettamente riservate.
Il loro utilizzo è consentito esclusivamente al destinatario del messaggio per le finalità indicate nel messaggio stesso.
Colui che riceve il presente messaggio è gentilmente pregato di verificare se lo stesso non gli sia pervenuto per errore.
In tal caso il destinatario è pregato di avvisare il mittente e, tenuto conto delle responsabilità connesse all'indebito
utilizzo e/o divulgazione del messaggio e/o delle informazioni in esso contenute, di cancellare l'originale
oltre a distruggere ogni copia o stampa.

[Matthieu DUBAIL]

Also, MBP displays are really difficult to calibrate well from my experience.
Matthieu DUBAIL
matthieu-dubail.com
Paris, 8ème

For photo, it's ok.
If you plan to do video, consider a Macbook pro equipped with a NVidia
video card.
I personnaly have to own a mac also since all my clients do own one,
but if it's not your case, it's way overpriced.
Matthieu DUBAIL
matthieu-dubail.com
Paris, 8ème

Post by Stephen T
This is not an argyllcms question. I don't know Apple, but think you will
still require a high quality display in you office. A calibrated laptop is
OK on the road, but the size, quality and viewing conditions are not enough
for critical photo editing. So I plug my NEC display into the HDMI port of
my laptop. It doesn't matter that my laptop display is crap.
Stephen.
On Sunday, 21 September 2014, 2:50, carlo rondinelli
...try also RawTherapee, it's free and probably the best.
--
Carlo Rondinelli - Still-life e Fotografia Immersiva per Virtual Tour
mob: + 39 389 9757042
skype: carlopano360
flickr.com/photos/carlorondinelli
alessiasalera.com
Avvertenze ai sensi del D.L.G.S. 196/2003 e successivi
Le informazioni contenute in questo messaggio e/o nel/i file/s allegato/i,
sono da considerarsi strettamente riservate.
Il loro utilizzo è consentito esclusivamente al destinatario del messaggio
per le finalità indicate nel messaggio stesso.
Colui che riceve il presente messaggio è gentilmente pregato di verificare
se lo stesso non gli sia pervenuto per errore.
In tal caso il destinatario è pregato di avvisare il mittente e, tenuto
conto delle responsabilità connesse all'indebito
utilizzo e/o divulgazione del messaggio e/o delle informazioni in esso
contenute, di cancellare l'originale
oltre a distruggere ogni copia o stampa.

[Matthieu DUBAIL]

For photo, it's ok.
If you plan to do video, consider a Macbook pro equipped with a NVidia
video card.
I personnaly have to own a mac also since all my clients do own one,
but if it's not your case, it's way overpriced.
Matthieu DUBAIL
matthieu-dubail.com
Paris, 8ème

Post by Stephen T
This is not an argyllcms question. I don't know Apple, but think you will
still require a high quality display in you office. A calibrated laptop is
OK on the road, but the size, quality and viewing conditions are not enough
for critical photo editing. So I plug my NEC display into the HDMI port of
my laptop. It doesn't matter that my laptop display is crap.
Stephen.
On Sunday, 21 September 2014, 2:50, carlo rondinelli
...try also RawTherapee, it's free and probably the best.
--
Carlo Rondinelli - Still-life e Fotografia Immersiva per Virtual Tour
mob: + 39 389 9757042
skype: carlopano360
flickr.com/photos/carlorondinelli
alessiasalera.com
Avvertenze ai sensi del D.L.G.S. 196/2003 e successivi
Le informazioni contenute in questo messaggio e/o nel/i file/s allegato/i,
sono da considerarsi strettamente riservate.
Il loro utilizzo è consentito esclusivamente al destinatario del messaggio
per le finalità indicate nel messaggio stesso.
Colui che riceve il presente messaggio è gentilmente pregato di verificare
se lo stesso non gli sia pervenuto per errore.
In tal caso il destinatario è pregato di avvisare il mittente e, tenuto
conto delle responsabilità connesse all'indebito
utilizzo e/o divulgazione del messaggio e/o delle informazioni in esso
contenute, di cancellare l'originale
oltre a distruggere ogni copia o stampa.

[Marwan Daar]

I'm working on a project involving measuring luminance stability over
time, and am wondering if it's possible to use Argyll to perform
continuous measurements of a test pattern (either generated by Argyll,
or preferably one that I load manually), and store each measurement. I'm
using an i1 display pro. One way I can think of is using targen to
generate a chart that just repeats the same test patch over and over,
but I'm curious if there are any more direct ways.

Alternatively, is it possible to interface with the i1 display pro with
Matlab?

thanks,
Marwan

[Jean-Pierre Vial]

Post by Marwan Daar
I'm working on a project involving measuring luminance stability over
time, and am wondering if it's possible to use Argyll to perform
continuous measurements of a test pattern (either generated by Argyll,
or preferably one that I load manually), and store each measurement. I'm
using an i1 display pro. One way I can think of is using targen to
generate a chart that just repeats the same test patch over and over,
but I'm curious if there are any more direct ways.

If you use a UNIX machine (Linux or BSD) you just need to add a cron
task to repeat your test every 15 mn, or any perodicity that suits your
problem.
I believe that this solution works also on a Mac, but most Mac users do
not know how to use te command-line-interface of MACOSX, and since I am
not a Mac-user, I cannot help.
On Windows, I fear that it may be more painful.

[Mathieu GRENET]

you may have trouble with internal calibration, that may prevent
unatended reading. even with bypass option my colormunky keep requiering
it every half an hour or so.
I don't know for the i1.

Post by Jean-Pierre Vial

Post by Marwan Daar
I'm working on a project involving measuring luminance stability over
time, and am wondering if it's possible to use Argyll to perform
continuous measurements of a test pattern (either generated by Argyll,
or preferably one that I load manually), and store each measurement. I'm
using an i1 display pro. One way I can think of is using targen to
generate a chart that just repeats the same test patch over and over,
but I'm curious if there are any more direct ways.

If you use a UNIX machine (Linux or BSD) you just need to add a cron
task to repeat your test every 15 mn, or any perodicity that suits your
problem.
I believe that this solution works also on a Mac, but most Mac users do
not know how to use te command-line-interface of MACOSX, and since I am
not a Mac-user, I cannot help.
On Windows, I fear that it may be more painful.

[Marwan Daar]

The i1 display pro seems to be stable without regular calibration, but
data from my readings may actually shed light here.

Post by Mathieu GRENET
you may have trouble with internal calibration, that may prevent
unatended reading. even with bypass option my colormunky keep
requiering it every half an hour or so.
I don't know for the i1.

[Marwan Daar]

I'm on Windows, but your suggestion may point me in a good direction,
thanks!

Also, as it happens, I just learned how to do this in HCFR.

Post by Jean-Pierre Vial
If you use a UNIX machine (Linux or BSD) you just need to add a cron
task to repeat your test every 15 mn, or any perodicity that suits
your problem. I believe that this solution works also on a Mac, but
most Mac users do not know how to use te command-line-interface of
MACOSX, and since I am not a Mac-user, I cannot help. On Windows, I
fear that it may be more painful.

[Graeme Gill]

I'm working on a project involving measuring luminance stability over time, and am
wondering if it's possible to use Argyll to perform continuous measurements of a test
pattern (either generated by Argyll, or preferably one that I load manually), and store
each measurement. I'm using an i1 display pro. One way I can think of is using targen to
generate a chart that just repeats the same test patch over and over, but I'm curious if
there are any more direct ways.

Hi,

Yes, that would work. The next version of spotread has a -O option that
lets you do a one-shot from something like a shell script in combination
with -N to suppress initial instrument calibration.

Alternatively, is it possible to interface with the i1 display pro with Matlab?

Sorry, I don't know if someone has done something like that.

Another possibility is to use HCFR - I think it will capture
a series of measurements.

Graeme Gill.

[Marwan Daar]

thanks Graeme. Looking forward to the next update, and yep, managed to
get HCFR to do the job.

Marwan

Post by Graeme Gill
Hi,
Yes, that would work. The next version of spotread has a -O option that
lets you do a one-shot from something like a shell script in combination
with -N to suppress initial instrument calibration.

Alternatively, is it possible to interface with the i1 display pro with Matlab?

Sorry, I don't know if someone has done something like that.
Another possibility is to use HCFR - I think it will capture
a series of measurements.
Graeme Gill.

[r***@public.gmane.org]

Hi,

I need to be able to convert from a larger working space like Adobe RGB or
ProPhoto RGB to sRGB and I would like to do it using a Perceptual mapping
(which isn't possible directly as only a Relative Colorimetric mapping is
available between working spaces).

Is it possible to construct a table-based profile to map to an intermediate
image file, so that I can do a Perceptual map to this image file and then a
RC mapping to sRGB?

If it is, then how would I go about making this profile using Argyll?
Ideally I would like the same profile for the forward and reverse mapping.

If at all possible I would like to be able to do this mathematically, rather
than by trying to scan from color spots from my monitor ... or something
like that!

Help much appreciated!!

Robert

[Graeme Gill]

Post by r***@public.gmane.org
I need to be able to convert from a larger working space like Adobe RGB or
ProPhoto RGB to sRGB and I would like to do it using a Perceptual mapping
(which isn't possible directly as only a Relative Colorimetric mapping is
available between working spaces).

Hi,
you don't explain why you can't use Perceptual mapping - certainly
nothing in ArgyllCMS prevents this. Simply create a perceptual conversion
device link using collink, using the colorspaces and target gamut of your
choice, and apply it to your images using cctiff.

Graeme Gill.

[r***@public.gmane.org]

Hi Graham,

Well from Photoshop (which is where I would do most of the workspace
mapping) I only have the standard icc profiles and they are all
matrix-based.

I don't know ArgyllCMS well enough to know how to construct a table-based
profile for workspace-workspace mapping (but Claas has very kindly shown me
how, so now I do know).

Now that you mention it, I see that I could also do the conversion using
cctiff ... but from a workflow point of view it's easier doing it all in
Photoshop using Convert to Profile (to the collink-generated profile)
followed by Assign Profile to the standard color space profile, as Class has
explained to me.

Robert

-----Original Message-----
From: argyllcms-bounce-***@public.gmane.org [mailto:argyllcms-bounce-***@public.gmane.org]
On Behalf Of Graeme Gill
Sent: 05 October 2014 23:17
To: argyllcms-***@public.gmane.org
Subject: [argyllcms] Re: Workspace mapping

Post by r***@public.gmane.org
I need to be able to convert from a larger working space like Adobe RGB or
ProPhoto RGB to sRGB and I would like to do it using a Perceptual mapping
(which isn't possible directly as only a Relative Colorimetric mapping is
available between working spaces).

Hi,
you don't explain why you can't use Perceptual mapping - certainly
nothing in ArgyllCMS prevents this. Simply create a perceptual conversion
device link using collink, using the colorspaces and target gamut of your
choice, and apply it to your images using cctiff.

Graeme Gill.

[Graeme Gill]

Post by r***@public.gmane.org
Well from Photoshop (which is where I would do most of the workspace
mapping) I only have the standard icc profiles and they are all
matrix-based.
I don't know ArgyllCMS well enough to know how to construct a table-based
profile for workspace-workspace mapping (but Claas has very kindly shown me
how, so now I do know).

It depends on what workflow you are after. As Claas outline, you can
certainly create a CLUT sRGB profile that can then include
gamut mapping in its B2A tables by creating a test chart and using
fakeread + colprof.

Post by r***@public.gmane.org
Now that you mention it, I see that I could also do the conversion using
cctiff ... but from a workflow point of view it's easier doing it all in
Photoshop using Convert to Profile (to the collink-generated profile)
followed by Assign Profile to the standard color space profile, as Class has
explained to me.

Right, but a device link using "collink -G ..." will result in a much
higher quality transformation directly from one RGB space to another.

Graeme Gill.

[r***@public.gmane.org]

Thanks Graham,

Could you confirm that the following is correct for an optimal ProPhoto to
sRGB mapping please?

tiffgamut -v -pj ProPhoto.icm Gamut_Test_File_Flat.tif
collink -v -qm -gGamut_Test_File_Flat.gam -ip -cmt -dmt ProPhoto.icm
sRGB.icm PP2sRGB.icm
cctiff -v -ip -e sRGB.icm PP2sRGB.icm Gamut_Test_File_Flat.tif GTF.tif

I've tried it and it seems to work ... but as there are so many options in
the various commands it's easy (for me) to make mistakes or complicate
things unnecessarily.

Many thanks

Robert

-----Original Message-----
From: argyllcms-bounce-***@public.gmane.org [mailto:argyllcms-bounce-***@public.gmane.org]
On Behalf Of Graeme Gill
Sent: 06 October 2014 00:31
To: argyllcms-***@public.gmane.org
Subject: [argyllcms] Re: Workspace mapping

Post by r***@public.gmane.org
Well from Photoshop (which is where I would do most of the workspace
mapping) I only have the standard icc profiles and they are all
matrix-based.
I don't know ArgyllCMS well enough to know how to construct a table-based
profile for workspace-workspace mapping (but Claas has very kindly shown me
how, so now I do know).

It depends on what workflow you are after. As Claas outline, you can
certainly create a CLUT sRGB profile that can then include
gamut mapping in its B2A tables by creating a test chart and using
fakeread + colprof.

Post by r***@public.gmane.org
Now that you mention it, I see that I could also do the conversion using
cctiff ... but from a workflow point of view it's easier doing it all in
Photoshop using Convert to Profile (to the collink-generated profile)
followed by Assign Profile to the standard color space profile, as Class has
explained to me.

Right, but a device link using "collink -G ..." will result in a much
higher quality transformation directly from one RGB space to another.

Graeme Gill.

[r***@public.gmane.org]

Having not yet received a reply to my post (see below), I'm asking the
question again, but adding a bit extra this time.

The ICC has released a v4 sRGB profile (Beta release) that provides both
Relative and Perceptual mapping to other workspaces (although I see from
Graham's documentation that he says that: "The chief drawback (of v4), is
that only one (non colorimetric) intent can really be supported, that of
saturation").

I've tried out the ICC sRGB v4 profile and although I can't say that the
perceptual mapping works well in the images I've tried (the usual v2 RC
mapping to sRGB seems to give better results with LESS clipping!), it would
seem to be a step in the right direction.

If I do a further conversion, from the v4 sRGB to v2 sRGB the image
improves, but it's still worse than the direct v2 mapped image.

Could this be due to v2/v4 mismatching? My monitor profile for example, is a
v2.2 profile. I'm comparing the images in Photoshop.

Any advice, explanations, insights?

Robert

-----Original Message-----
From: robert-bwQay9wdFlLEb97390d+***@public.gmane.org [mailto:robert-bwQay9wdFlLEb97390d+***@public.gmane.org]
Sent: 03 October 2014 11:01
To: 'argyllcms-***@public.gmane.org'
Subject: Workspace mapping

Hi,

I need to be able to convert from a larger working space like Adobe RGB or
ProPhoto RGB to sRGB and I would like to do it using a Perceptual mapping
(which isn't possible directly as only a Relative Colorimetric mapping is
available between working spaces).

Is it possible to construct a table-based profile to map to an intermediate
image file, so that I can do a Perceptual map to this image file and then a
RC mapping to sRGB?

If it is, then how would I go about making this profile using Argyll?
Ideally I would like the same profile for the forward and reverse mapping.

If at all possible I would like to be able to do this mathematically, rather
than by trying to scan from color spots from my monitor ... or something
like that!

Help much appreciated!!

Robert

[Florian Höch]

As I understand it, the ICCv4 "preference" sRGB profile is primarily
meant to be used as source profile when mapping directly into an
(preferably ICCv4, LUT-based) output/printer profile.
When converting to a (matrix-based) working space, you'll loose the
ability to get a true perceptual mapping.

Post by r***@public.gmane.org
The ICC has released a v4 sRGB profile (Beta release) that provides both
Relative and Perceptual mapping to other workspaces (although I see from
Graham's documentation that he says that: "The chief drawback (of v4), is
that only one (non colorimetric) intent can really be supported, that of
saturation").
I've tried out the ICC sRGB v4 profile and although I can't say that the
perceptual mapping works well in the images I've tried (the usual v2 RC
mapping to sRGB seems to give better results with LESS clipping!), it would
seem to be a step in the right direction.
If I do a further conversion, from the v4 sRGB to v2 sRGB the image
improves, but it's still worse than the direct v2 mapped image.
Could this be due to v2/v4 mismatching? My monitor profile for example, is a
v2.2 profile. I'm comparing the images in Photoshop.
Any advice, explanations, insights?

[r***@public.gmane.org]

Is it also intended as a destination profile when mapping from another v2
workspace? If not, how does one get one's image into the sRGB v4?

The issue I'm trying to address is converting to sRGB for web viewing when
the normal relative colorimetric intent does a bad job. I would then like
to be able to try a perceptual mapping (which isn't possible with the v2
matrix-based profiles). My original question was whether or not it would be
possible to construct a v2 table-based sRGB profile so that a perceptual
mapping could be used (with a final conversion to the standard matrix-based
sRGB profile, presumably).

Or perhaps it has already been done?

Robert

-----Original Message-----
From: argyllcms-bounce-***@public.gmane.org [mailto:argyllcms-bounce-***@public.gmane.org]
On Behalf Of Florian Höch
Sent: 05 October 2014 12:28
To: argyllcms-***@public.gmane.org
Subject: [argyllcms] Re: FW: Workspace mapping

As I understand it, the ICCv4 "preference" sRGB profile is primarily
meant to be used as source profile when mapping directly into an
(preferably ICCv4, LUT-based) output/printer profile.
When converting to a (matrix-based) working space, you'll loose the
ability to get a true perceptual mapping.

Post by r***@public.gmane.org
The ICC has released a v4 sRGB profile (Beta release) that provides both
Relative and Perceptual mapping to other workspaces (although I see from
Graham's documentation that he says that: "The chief drawback (of v4), is
that only one (non colorimetric) intent can really be supported, that of
saturation").
I've tried out the ICC sRGB v4 profile and although I can't say that the
perceptual mapping works well in the images I've tried (the usual v2 RC
mapping to sRGB seems to give better results with LESS clipping!), it would
seem to be a step in the right direction.
If I do a further conversion, from the v4 sRGB to v2 sRGB the image
improves, but it's still worse than the direct v2 mapped image.
Could this be due to v2/v4 mismatching? My monitor profile for example, is a
v2.2 profile. I'm comparing the images in Photoshop.
Any advice, explanations, insights?

[Claas Bickeböller]

Hi,

of course it is possible to create an sRGB profile with real gamut mapping.
The easiest way is to drag & drop the sRGB profile onto basICColor dropRGB.
It will create an RGB printer profile with gamut compression (instead of clipping) which you can use as destination profile.
After the conversion assign the original sRGB.

Using Argyll sth. similar to this should do the job:
targen -d2 rgbpatches
fakeread rgbpatches
colprof -v -s path_to_your_AdobeRGB1998.icc rgbpatches

Best regards

Claas

Post by r***@public.gmane.org
Is it also intended as a destination profile when mapping from another v2
workspace? If not, how does one get one's image into the sRGB v4?
The issue I'm trying to address is converting to sRGB for web viewing when
the normal relative colorimetric intent does a bad job. I would then like
to be able to try a perceptual mapping (which isn't possible with the v2
matrix-based profiles). My original question was whether or not it would be
possible to construct a v2 table-based sRGB profile so that a perceptual
mapping could be used (with a final conversion to the standard matrix-based
sRGB profile, presumably).
Or perhaps it has already been done?
Robert
-----Original Message-----
On Behalf Of Florian Höch
Sent: 05 October 2014 12:28
Subject: [argyllcms] Re: FW: Workspace mapping
As I understand it, the ICCv4 "preference" sRGB profile is primarily
meant to be used as source profile when mapping directly into an
(preferably ICCv4, LUT-based) output/printer profile.
When converting to a (matrix-based) working space, you'll loose the
ability to get a true perceptual mapping.

Post by r***@public.gmane.org
The ICC has released a v4 sRGB profile (Beta release) that provides both
Relative and Perceptual mapping to other workspaces (although I see from
Graham's documentation that he says that: "The chief drawback (of v4), is
that only one (non colorimetric) intent can really be supported, that of
saturation").
I've tried out the ICC sRGB v4 profile and although I can't say that the
perceptual mapping works well in the images I've tried (the usual v2 RC
mapping to sRGB seems to give better results with LESS clipping!), it

would

Post by r***@public.gmane.org
seem to be a step in the right direction.
If I do a further conversion, from the v4 sRGB to v2 sRGB the image
improves, but it's still worse than the direct v2 mapped image.
Could this be due to v2/v4 mismatching? My monitor profile for example, is

a

Post by r***@public.gmane.org
v2.2 profile. I'm comparing the images in Photoshop.
Any advice, explanations, insights?

--
Florian Höch

[Claas Bickeböller]

Sorry,

of course:

fakeread path_to_sRGB_profile rgbpatches

Post by Claas Bickeböller
Hi,
of course it is possible to create an sRGB profile with real gamut mapping.
The easiest way is to drag & drop the sRGB profile onto basICColor dropRGB.
It will create an RGB printer profile with gamut compression (instead of clipping) which you can use as destination profile.
After the conversion assign the original sRGB.
targen -d2 rgbpatches
fakeread rgbpatches
colprof -v -s path_to_your_AdobeRGB1998.icc rgbpatches
Best regards
Claas

Post by r***@public.gmane.org
Is it also intended as a destination profile when mapping from another v2
workspace? If not, how does one get one's image into the sRGB v4?
The issue I'm trying to address is converting to sRGB for web viewing when
the normal relative colorimetric intent does a bad job. I would then like
to be able to try a perceptual mapping (which isn't possible with the v2
matrix-based profiles). My original question was whether or not it would be
possible to construct a v2 table-based sRGB profile so that a perceptual
mapping could be used (with a final conversion to the standard matrix-based
sRGB profile, presumably).
Or perhaps it has already been done?
Robert
-----Original Message-----
On Behalf Of Florian Höch
Sent: 05 October 2014 12:28
Subject: [argyllcms] Re: FW: Workspace mapping
As I understand it, the ICCv4 "preference" sRGB profile is primarily
meant to be used as source profile when mapping directly into an
(preferably ICCv4, LUT-based) output/printer profile.
When converting to a (matrix-based) working space, you'll loose the
ability to get a true perceptual mapping.

Post by r***@public.gmane.org
The ICC has released a v4 sRGB profile (Beta release) that provides both
Relative and Perceptual mapping to other workspaces (although I see from
Graham's documentation that he says that: "The chief drawback (of v4), is
that only one (non colorimetric) intent can really be supported, that of
saturation").
I've tried out the ICC sRGB v4 profile and although I can't say that the
perceptual mapping works well in the images I've tried (the usual v2 RC
mapping to sRGB seems to give better results with LESS clipping!), it

would

Post by r***@public.gmane.org
seem to be a step in the right direction.
If I do a further conversion, from the v4 sRGB to v2 sRGB the image
improves, but it's still worse than the direct v2 mapped image.
Could this be due to v2/v4 mismatching? My monitor profile for example, is

a

Post by r***@public.gmane.org
v2.2 profile. I'm comparing the images in Photoshop.
Any advice, explanations, insights?

--
Florian Höch

[r***@public.gmane.org]

Many thanks Claas.

I've tried the Argyll method and it seems to work very well. I haven't
tried the basICColor as I don't have it.

Robert

-----Original Message-----
From: argyllcms-bounce-***@public.gmane.org [mailto:argyllcms-bounce-***@public.gmane.org]
On Behalf Of Claas Bickeböller
Sent: 05 October 2014 16:31
To: argyllcms-***@public.gmane.org
Subject: [argyllcms] Re: Workspace mapping

Sorry,

of course:

fakeread path_to_sRGB_profile rgbpatches

Post by Claas Bickeböller
Hi,
of course it is possible to create an sRGB profile with real gamut mapping.
The easiest way is to drag & drop the sRGB profile onto basICColor dropRGB.
It will create an RGB printer profile with gamut compression (instead of

clipping) which you can use as destination profile.

Post by Claas Bickeböller
After the conversion assign the original sRGB.
targen -d2 rgbpatches
fakeread rgbpatches
colprof -v -s path_to_your_AdobeRGB1998.icc rgbpatches
Best regards
Claas

Post by r***@public.gmane.org
Is it also intended as a destination profile when mapping from another v2
workspace? If not, how does one get one's image into the sRGB v4?
The issue I'm trying to address is converting to sRGB for web viewing when
the normal relative colorimetric intent does a bad job. I would then like
to be able to try a perceptual mapping (which isn't possible with the v2
matrix-based profiles). My original question was whether or not it would be
possible to construct a v2 table-based sRGB profile so that a perceptual
mapping could be used (with a final conversion to the standard matrix-based
sRGB profile, presumably).
Or perhaps it has already been done?
Robert
-----Original Message-----
On Behalf Of Florian Höch
Sent: 05 October 2014 12:28
Subject: [argyllcms] Re: FW: Workspace mapping
As I understand it, the ICCv4 "preference" sRGB profile is primarily
meant to be used as source profile when mapping directly into an
(preferably ICCv4, LUT-based) output/printer profile.
When converting to a (matrix-based) working space, you'll loose the
ability to get a true perceptual mapping.

Post by r***@public.gmane.org
The ICC has released a v4 sRGB profile (Beta release) that provides both
Relative and Perceptual mapping to other workspaces (although I see from
Graham's documentation that he says that: "The chief drawback (of v4), is
that only one (non colorimetric) intent can really be supported, that of
saturation").
I've tried out the ICC sRGB v4 profile and although I can't say that the
perceptual mapping works well in the images I've tried (the usual v2 RC
mapping to sRGB seems to give better results with LESS clipping!), it

would

Post by r***@public.gmane.org
seem to be a step in the right direction.
If I do a further conversion, from the v4 sRGB to v2 sRGB the image
improves, but it's still worse than the direct v2 mapped image.
Could this be due to v2/v4 mismatching? My monitor profile for example, is

a

Post by r***@public.gmane.org
v2.2 profile. I'm comparing the images in Photoshop.
Any advice, explanations, insights?

--
Florian Höch