RE: Article on Photoshop CS4 and DeviceLink profile
RE: Article on Photoshop CS4 and DeviceLink profile
- Subject: RE: Article on Photoshop CS4 and DeviceLink profile
- From: "Rohit A. Patil" <email@hidden>
- Date: Thu, 4 Dec 2008 14:13:21 -0700
- Thread-topic: Article on Photoshop CS4 and DeviceLink profile
Hi,
Since this is my first post on the forum, I will let my email signature
do the introduction.
Chris brings up a very good point, "many multichannel profiles will
contain good B2A tables and absolutely minimal A2B tables".
But, I would not blame the profile builders for the poor A2B transform
accuracy given the current LUT based approach in the ICC. It is
prohibitively expensive (in terms of space and profile build time) to
have an accurate LUT for A2B with 6 or 7 channels and more!
This might be off topic, but what we need is a different approach in
encoding an A2B transform in such cases.
Regards,
Rohit Patil
Color Science Engineer
ONYX Graphics Inc.
-----Original Message-----
From: colorsync-users-bounces+rohit.patil=email@hidden
[mailto:colorsync-users-bounces+rohit.patil=email@hidden]
On Behalf Of Chris Cox
Sent: Thursday, December 04, 2008 1:24 PM
To: email@hidden
Subject: Re: Article on Photoshop CS4 and DeviceLink profile
Graeme;
As you may have seen, many multichannel profiles will contain good B2A
tables and absolutely minimal A2B tables. That also makes the reverse
process difficult, or highly inaccurate. (and happened in the majority
of example multichannel profiles we found). We are trying to improve
the technology to preview more than 4 channels in realtime, but with so
many bad profiles to test against....
Chris
On 12/4/08 12:03 PM, "email@hidden"
<email@hidden> wrote:
Message: 5
Date: Thu, 04 Dec 2008 10:01:37 +1100
From: Graeme Gill <email@hidden>
Subject: Re: Article on Photoshop CS4 and DeviceLink profile
To: ColorSync List <email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Koch Karl wrote:
> Am 02.12.2008 um 20:22 schrieb Chris Cox:
>> And you're in multichannel mode without any information about the
>> destination colorspace.
> This I don?t understand. As far as I thought I had understood the
> innards of Photoshop, you always have the information of your monitor
> color space which acts as a destination colorspace.
It's not the monitor colorspace that is a mystery, it's the colorspace
the multichannel file is in that's a mystery. If a multichannel
profile only contains a B2A table (naughty! - not compliant with
ICC specs!), then it's possible to convert into that space, but
not out again, so it's not possible to display it correctly
on the monitor.
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