[argyllcms] Re: FW: Workspace mapping
- From: Claas Bickeböller <lists@xxxxxxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sun, 5 Oct 2014 17:25:42 +0200
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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