[argyllcms] Re: Workspace mapping
- From: <robert@xxxxxxxxxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Sun, 5 Oct 2014 23:50:39 +0100
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@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
On Behalf Of Claas Bickeböller
Sent: 05 October 2014 16:31
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: Workspace mapping
Sorry,
of course:
fakeread path_to_sRGB_profile rgbpatches
Am 05.10.2014 um 17:25 schrieb Claas Bickeböller <lists@xxxxxxxxxxxxxxxxx>:
> 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
>
> Am 05.10.2014 um 15:34 schrieb <robert@xxxxxxxxxxxxxxxxxx>
<robert@xxxxxxxxxxxxxxxxxx>:
>
>> 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@xxxxxxxxxxxxx
[mailto:argyllcms-bounce@xxxxxxxxxxxxx]
>> On Behalf Of Florian Höch
>> Sent: 05 October 2014 12:28
>> To: argyllcms@xxxxxxxxxxxxx
>> 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.
>>
>> Am 05.10.2014 um 13:09 schrieb robert@xxxxxxxxxxxxxxxxxx:
>>> 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?
>>
>> --
>> Florian Höch
>>
>>
>>
>>
>
>
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