Re: Colorsync-users Digest, Vol 6, Issue 90
Re: Colorsync-users Digest, Vol 6, Issue 90
- Subject: Re: Colorsync-users Digest, Vol 6, Issue 90
- From: Chris Cox <email@hidden>
- Date: Tue, 28 Apr 2009 12:45:13 -0700
- Acceptlanguage: en-US
- Thread-topic: Colorsync-users Digest, Vol 6, Issue 90
Marco;
No, most device link profiles that we found still donĀ¹t have the destination
profile information in them. Only the most recent tools appear to embed the
destination profile data (and they're still inconsistent about how much they
embed, and at least one had to fix a bug because they embedded truncated
information).
That's why Photoshop can't reliably obtain the destination information. We
have the code in place to do so, but, well, without widespread profile
support it was kinda hard to test -- so we turned it off for now.
Chris
> Message: 10
> Date: Tue, 28 Apr 2009 11:46:04 -0700
> From: Marco Ugolini <email@hidden>
> Subject: Re: Photoshop CS4 DeviceLink CMM Engine
> To: Koch Karl <email@hidden>
> Cc: ColorSync Users Mailing List <email@hidden>
> Message-ID: <C61C9CFC.1AEB7%email@hidden>
> Content-Type: text/plain; charset="ISO-8859-1"
>
> In a message dated 4/28/09 1:14 AM, Koch Karl wrote:
>
>> Joseph, Marc,
>>
>> let me try to explain:
>> The differences between the Adobe and Apple CMMs and the DeviceLink
>> CMM result from a bug (or should I call it a feature) in Adobe
>> Photoshop.
>> When you convert from one color space into another one with a
>> DeviceLink in Photoshop's Convert to Profile Advanced Conversion
>> Options, Photoshop does NOT assign the destination profile as the new
>> document profile. You have to do that manually in order to get the
>> correct appearance on your (calibrated and profiled) monitor.
>> In contrast, basICColor demon reassigns the destination profile
>> automatically so that you have the correct appearance immediately
>> after the conversion ? the same as with the other CMMs after assigning
>> the profile manually.
>
> It seems that the device link conversion feature in Photoshop CS4 is still a
> first step, a rough introduction to the functionality, with much room for
> improvement -- which hopefully will come.
>
> One question I have, though, is the following: do *all* device link profiles
> contain precise information on the destination color space, or a copy of the
> destination profile within them? If they don't, how would Photoshop know
> which profile to assign post-conversion, if and when it should be made
> capable of doing that?
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